音标:[eksˈtə:nl ɡaid ˈsi:kwəns] ;
[医]外在引导序列,外部剪接指导序列[于被剪接的mRNA分子外部的剪接指导顺序]

Editors note: This is the third episode of four-part series on verb tenses. Be sure to listen to part one and part two first. For VOA Learning English, this is Everyday Grammar. Today we are going to talk about the perfect verb tenses. Perfect tenses

发表于:2018-11-27 / 阅读(453) / 评论(0) 分类 2016年VOA慢速英语(十二)月

Section A [00:01.23]1. M: I haven't decided which subject to major in [00:04.96]physics or chemistry. [00:07.76]W: It isn't easy to choose,is it? [00:10.21]Q: What does the woman mean? [00:13.87]2. W: The map shows that this street goes downtown. [00

发表于:2018-11-29 / 阅读(244) / 评论(0) 分类 决胜四级听力必备

Section A [00:01.54]1. M: My grandpa died in 1978. I was 18 years then. [00:08.20]W: That means he would be 76 if he were alive. [00:11.49]Q: How old was his grandpa when he was dead? [00:14.45]2. M: Why are you going so fast? [00:17.53]Where are you

发表于:2018-12-01 / 阅读(296) / 评论(0) 分类 决胜六级英语听力

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Its the time of year to take a look backand thats just what the journal Science did as they listed their most important breakthroughs of 2008. At the v

发表于:2018-12-02 / 阅读(183) / 评论(0) 分类 Scientific American(十二)月

图片 by Jason Marshall Its not often someone suggests that knowing some math could make you the life of the party, but thats exactly what Im going to do. Yes, a properly timed delivery of a few fun facts about the famed Fibonacci sequence just migh

发表于:2018-12-07 / 阅读(171) / 评论(0) 分类 数学英语

[ti:UNIT 7 Enjoy Your Hobby Lesson 56:Unit Review] [0:01.051]Unit 7 [0:02.631]Enjoy Your Hobby [0:04.894]Lesson 56: [0:06.943]Unit Review [0:08.907]I. [0:10.231]Building Your Vocabulary [0:12.963]A. [0:14.500]Fill in each blank with the proper word o

发表于:2018-12-10 / 阅读(181) / 评论(0) 分类 河北教育初中英语(初中起点)八年级上

发表于:2018-12-12 / 阅读(122) / 评论(0) 分类 医务英语

This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute? The human genome was sequenced, and in the process of moving that forward the technology that was developed was incredible. And because of their efforts in human genome,

发表于:2018-12-24 / 阅读(226) / 评论(0) 分类 Scientific American(十)月

Describing Order and Sequence Patrick: Okay, your first task is to put all of these files in order. Maya: Wow, there must be hundreds of files in this storeroom. How am I supposed to organize them? Patrick: Create a basic filing system. Put things in

发表于:2018-12-27 / 阅读(171) / 评论(0) 分类 2014年ESL之商务英语

25.Could you check it out, please? 25.麻烦你们来看一下好吗? 26.Could you fix it? 26.你能修好吗? 27.I'll have that taken care of immediately. 27.我马上处理这件事。 28.How do I use the safe in my room? 28.房间里的保险箱

发表于:2018-12-29 / 阅读(154) / 评论(0) 分类 实境旅游英语

如果你的生活并不称心如意,不要只说:我们的时机会来的。或总有一天情况会好转的。 Don't just stand there Many people think that they have to accept whatever life throws at them. They'll say, This is my fate, my des

发表于:2019-01-02 / 阅读(182) / 评论(0) 分类 精美英文欣赏

图片 by Jason Marshall Some math is functional. Some math is fun. And some math is simply stunning. If that last description sounds improbable to you, then today just might change your mind. Because now that weve covered enough ground, were going t

发表于:2019-01-02 / 阅读(262) / 评论(0) 分类 数学英语

This is Scientific American's 60-Second Science. I'm Steve Mirsky, got a minute? Neandertals were our closest relatives. And now we know a lot more about them. Because researchers have for the first time sequenced a complete Neandertal genomethat of

发表于:2019-01-08 / 阅读(191) / 评论(0) 分类 Scientific American(八)月

This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute? Robin Williams thought that the platypus was cobbled together by an inebriated deity: Lets take a beaver. Lets put on a ducks bill. Now we know how weird the platypus is

发表于:2019-01-08 / 阅读(181) / 评论(0) 分类 Scientific American(五)月

古埃及金字塔是奴隶制帝王的陵墓,最宏大的当为吉萨三座大金字塔。塔基呈方形,每边长230米,高146米,用230余万块巨石(每块平均重达2.5吨)垒成,国王墓室用一块400吨重的石板垒成。整体规

发表于:2019-02-01 / 阅读(141) / 评论(0) 分类 阅读空间

BEIJING, Aug. 22 (Xinhuanet) -- Researchers have discovered how a human egg captures an incoming sperm for fertilization, paving the way to help couples suffering from infertility, according to media reports on Monday. An international team of resear

发表于:2019-02-08 / 阅读(193) / 评论(0) 分类 英语新闻

Listen to the schedule of a business trip. Fill in numbers l-8 to point out the sequence of the schedule. I'm leaving for Milan on the 7th of June. l'II arrive there on the 8th evening at about 7:OOpm. Then, l'II take a shuttle bus to the hotel. On t

发表于:2019-02-17 / 阅读(152) / 评论(0) 分类 英语听力练习题

Listen to the dialogues and write the correct sequence of l-6 as mentioned in the dialogues. A:How do I search books from the computer? B:First, key in your PIN number. Then, it goes to the Library's Homepage. Then, you can choose any way you want to

发表于:2019-02-17 / 阅读(131) / 评论(0) 分类 英语听力练习题

A longtime al-Qaida operative was killed in a U.S. airstrike in early July while traveling near Sarmada, Syria, the Pentagon said Tuesday. Muhsin al-Fadhli was traveling in a vehicle when he was hit July 8. Sarmada is in Idlib province in the norther

发表于:2019-02-17 / 阅读(154) / 评论(0) 分类 英语新闻

Thank you for being here,Fareed.Nice to have you on the show. 多谢你抽空前来 法里德 很高兴你能来上节目 Let's get started first with your background.I do think I know a lot about you. 首先聊聊你的背景 我觉得我很了解你

发表于:2019-02-23 / 阅读(179) / 评论(0) 分类 柯南脱口秀
学英语单词
allylveratrol
Ampelocissus hoabinhensis
antophene
astradas
aucleometer
auditing up to trial balance
Aurocuproite
author language
bizes
bottom hole angle
building equipment factory
Catatumbo
ch.b.
chesires
chicken-or-egg question
claydens
clomocyline
coefficient of standard oscillation
concurrent causes
concurrent operating control
corylus heterophylla fisch
cost of power supply of power plant
critical element
cutting plane
Emirali
endo-therapy
error statistics by tape volume
experiencings
family Oxyuridae
floating head backing device
gender-biaseds
germplasm resources
girlifying
graphic solution of a game
Guilin
head the bill
herken
hill fever
Hugo Wolf
idiostatic circuit
in your name
java software component
jig and fixture
jimmy hats
jungle boot
kavanaugh
Laue method
macroscopic neutron flux density distribution
may-blossoms
merfathers
modem transmission rate
multiple riveting
muriform
n-next
nature management
Naviculaceae
nick-nack
nitrogen fixation activity
Nocardia gardneri
nonvolatility
Nothnagel's sign
nucleonema
optimum action
out boxes
outwandering
paralinin
parathyroid insufficiency
phase-shifting capacitor
phi meson
phylogenically
pigeonholed wall
plane of deflation
porthole die
prosopinine
qualifiest
quick-closing hatchcover
retrofutures
saggar makers
shit-house
shrinkage mining
smoke bombs
spectral factoring
speeded-up
squall
statistical confluence analysis
succotash
there's no harm in
threshing-mill
throw-over plow
ticcing
to catch
top-hat
transaction processing monitor
trapezoidal approximation
turns loose
unisats
upper photic zone
urinary antiseptics
valve electrode
variable coupler
yhuld