n. 半衰期, 半排出期
[化] 半衰期; 半寿期
n the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)
词型变化:名词复数形式 : half-lives
词性分布:
名词100%

half-life的用法和样例:

例句

用作名词(n.)
  1. The time it takes for half of its original amount to decay is called the half-life.衰变至只剩下原来数目一半所需的时间称为该核素的半衰期。
  2. It is not necessary to wait until half of a sample has decayed in order to measure the halflife.不必一直等到样品衰变一半之后才测量它的半衰期。

词汇搭配

  • half life time半衰期
  • total half-life总半衰期
  • effective half-life有效半排出期,有效半...
  • radioactive half life放射半衰期,放射性物...
  • biological half life生物学半排出期,生物...
  • physical half life物理半衰期(放射性物...
  • half life半衰期(半衰变周期...
  • biological half-life生物学半衰期,生物半...
  • apparent half life表现半衰期
  • biologic half-life生物(学)半衰期...
  • radioactive half-life半衰期
  • half-life period半衰期
  • antibody half-life抗体半衰期
  • effective half life有效半排出期,有效半...
  • apparent half-life表观半衰期
【近义词】

When I was a boy, everybody urged me to get plenty of sunshine, so I got plenty of sunshine for a long time. One day while I was 1) absorbing July sun as fast as I could, a doctor asked what I thought

发表于:2018-11-28 / 阅读(176) / 评论(0) 分类 疯狂英语2002年

[00:01.17]A Truth of Life [00:04.46]One of my patients, a successful businessman, [00:08.28] tells me that before his cancer he would become depressed [00:11.78] unless things went a certain way. Happiness was having the cookie. [00:16.48] If you had

发表于:2018-11-30 / 阅读(127) / 评论(0) 分类 英语专业晨读美文

At 22,I didn't _______I need to worry about ______. But one afternoon ________, I ________a hill with a friend and I got really _______. I found I was not as fit as I had ________. So I decided I must get _______fit. And I did it by _______my exercis

发表于:2018-12-04 / 阅读(64) / 评论(0) 分类 听听测测

When Sharlock was about to cut Antonio with his knife. Posha stopped him. Wait a moment Sharlock she said. I have something else to say. You may have a pound of Antonio’s fresh but according to this

发表于:2018-12-05 / 阅读(74) / 评论(0) 分类 有声英语文学名著

Just for today Just for today I will try to live through this day only and not solve my whole life problem at once. I can do something for twelve hours that would appall me if I had to keep it up for a lifetime. Just for today I will be happy. This a

发表于:2018-12-07 / 阅读(162) / 评论(0) 分类 幸福是一种态度

I am at the very center of the great white continent, Antarctica. The South Pole is about half a mile away. For a thousand miles, in all directions, there is nothing but ice. And, in the whole of this

发表于:2018-12-07 / 阅读(72) / 评论(0) 分类 冰雪童话

Work is a very important part of life. People work in order to earn a living. A coun- try can only make progress if its people work. It is, therefore, important for us to be hard- working. When we wor

发表于:2018-12-08 / 阅读(433) / 评论(0) 分类 赖世雄初级美国英语

The Stray Dogs Five stray dogs were roaming about looking for something to eat when they came to a deep river.On the river bed they could see a bag full of bones that someone had thrown away. The bones looked very good and the dogs sat on the ban

发表于:2019-01-07 / 阅读(69) / 评论(0) 分类 趣味英语

Just for today I will try to live through this day only and not tackle my whole life problem at once. I can do something for twelve hours that would appall me if I had to keep it up for a lifetime. Just for today I will be happy. This assumes to be t

发表于:2019-01-08 / 阅读(111) / 评论(0) 分类 英语小短文

The author of the The Age of Miracles: A Novel (now out in paperback) reveals the kind of I'm sorry that can turn a marital mistake into a moment of connection. 1. I'm sorry I locked us out of our apartment building that night last January, while you

发表于:2019-01-08 / 阅读(108) / 评论(0) 分类 英语小短文

Can you be inspiring in 140 characters or less? 140个甚至更少的单词会让你受到鼓舞吗? This year, Twitter surpassed 500 million users, and while tweets from such a large base are surely not all inspiring, we'd prefer to focus on the o

发表于:2019-01-08 / 阅读(61) / 评论(0) 分类 励志英语

今天我们要学的词是larger than life。 Larger than life意思是给人留下深刻印象的,具有传奇色彩的。美国前总统西奥多.罗斯福是对美国历史产生重大影响的总统之一。He has a larger than life personalit

发表于:2019-01-10 / 阅读(71) / 评论(0) 分类 英语每日一词

Seventy-four-year-olds are the most contented people in the population, according to new research. 一项最新研究表明,人在74岁时最幸福。 Fewer responsibilities, financial worries and more time to yourself leads to contentment previous

发表于:2019-02-06 / 阅读(42) / 评论(0) 分类 阅读空间

Who Am I To Say Love of my life, my soulmate You're my best friend Part of me like breathing Now half of me is left Don't know anything at all Who am I to say you love me I don't know anything at all And who am I to say you need me Color me blue I'm

发表于:2019-02-07 / 阅读(66) / 评论(0) 分类 好听的英文歌曲

Love of my life, my soulmate You're my best friend Part of me like breathing Now half of me is left Don't know anything at all Who am I to say you love me I don't know anything at all And who am I to say you need me Color me blue I'm lost in you Don'

发表于:2019-02-13 / 阅读(66) / 评论(0) 分类 好听的英文歌曲

We found our second Blue Zone 我们找的第二个蓝区 on the other side of the planet, 在地球另一端 about 800 miles south of Tokyo, 离东京南部约800英里 on the archipelago of Okinawa. 在冲绳县的古拉格岛 Okinawa is actually 1

发表于:2019-02-14 / 阅读(92) / 评论(0) 分类 TED演讲科学篇

中国人称另一半为爱人,我丈夫妻子,我老公/婆,有孩子称孩子他爸(妈),俺家那口子,男的称呼妻子还有屋里的,内人,甚至古代/代还有贱内。那么在英语国家,人们向别人介绍另一半时如

发表于:2019-02-18 / 阅读(285) / 评论(0) 分类 英语口语

2012最具正能量的12句名言 Can you be inspiring in 140 characters or less? 140个甚至更少的单词会让你受到鼓舞吗? This year, Twitter surpassed 500 million users, and while tweets from such a large base are surely not all inspirin

发表于:2019-02-18 / 阅读(91) / 评论(0) 分类 英语美文

You don't actually have to take the quiz. Just read this straight through, and you'll get the point (an awesome one) it is trying to make! Take this quiz: 1. Name the five wealthiest people in the world. 2. Name the last five Heisman trophy winners.

发表于:2019-02-18 / 阅读(69) / 评论(0) 分类 阅读空间

Just for today I will try to live through this day only and not tackle my whole life problem at once. I can do something for twelve hours that would appall me if I had to keep it up for a lifetime. Just for today I will be happy. This assumes to be t

发表于:2019-02-20 / 阅读(60) / 评论(0) 分类 英语美文
学英语单词
a la carte advertising
a string attached
a-except-b gate
adit planimetric
aminimides
an engineer
anthoney
antinuclear antibodies
at the volley
Avalokiteshvara
Ayerbe
bedheads
blasphemist
cardiovascular scintiphotographic method
case-dough
cellulose lacquers
computer-on-a-chip
congenital fissure of earlobe
conscionless
construction document
construction layout
countercuttent extraction
coupist
coxal
current repair of road machine
current user
cycasterone
cyclical action
desublimation
diaclina quadrimaculata
disgruntedly
diver methol
elemented
euaugaptilus marginatus
exyrias belissimus
first flight neutron
fluorescent pumping
flutter board
foliform
geared index
ghost r.
grittings
gross ablation
hard-eyed
have a score to settle with somebody
heavily dope
human assisted reproduction
hunted down
in portraiture
intrinsic line wave
jeerers
leg member
lethingtons
little green men
long meters
lovehole
magic-marker
meannesses
mega-exhibition
Mental Masturbation
Mine-yama
mucuna hainanensis hay.
multitool holder
national newspaper index
newportite (ottrelite)
no-pass
noise calender
NSC-269148
nyklos
oh my fuck
out-turn sheet
Pearson Coefficient
pedele
pepsinhydrochloric acid
Piorini, L.
pocket shot
polytrichastrum formosum
poor-spiritedness
quarrying method
ramtil
regurgitaliths
relay bay
remote pick-up relay
rocklay
rotational pseudo gravity
sanberk
Scadoxus
Schr., schr.
second lower punch
shivoo
signal spectacle
suspense payment
tax-cuts
the citizen
thoracobronchotomy
torrefacto
trabelsi
tube tying
vertical stiffener
vindictive action
water detector
wdsu