沉积物和底水

But even if there had been water, life doesn't start overnight. Even a simple microbe is the product of complex chemical systems that take millions of years to evolve. Had the water lasted long enough

发表于:2018-12-07 / 阅读(70) / 评论(0) 分类 火星生命

Rice had seen the same thing in Iceland, one of the few places on Earth with similarities to Mars. It too is extremely cold, and most of the water is frozen into glaciers. And also like Mars, buried u

发表于:2018-12-07 / 阅读(80) / 评论(0) 分类 火星生命

Scientists Discover New Animal 科学家发现新的物种 From VOA Learning English, this is SCIENCE IN THE NEWS. Im June Simms. And Im Bob Doughty. Today we tell about a new animal species native to South America. We tell how agricultural chemical

发表于:2018-12-16 / 阅读(49) / 评论(0) 分类 2013年VOA慢速英语(八)月

Great Barrier Reef Choking on Pollutants 大堡礁遭遇前所未有的污染 Attempts to protect the Great Barrier Reef are failing. A report released Monday by the government in Australia says water quality in the Great Barrier Reef is far below wh

发表于:2018-12-16 / 阅读(57) / 评论(0) 分类 2015年VOA慢速英语(十)月

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Theres a Native American site in Ohio that appeared to be a fort. But recent discoveries by archaeologists at the University of Cincinnati show thats n

发表于:2018-12-24 / 阅读(91) / 评论(0) 分类 Scientific American(九)月

What was around the bend in rivers hundreds of millions of years ago? Its a trick questionbecause there werent any bends. Ancient rivers were typically just wide, sheetlike flows of water. New reports in the journals Geology and Earth-Science Reviews

发表于:2018-12-24 / 阅读(67) / 评论(0) 分类 Scientific American(一)月

The divers started in the ocean, but they are now within solid bedrock, 150 feet beneath someone's living room. They are now swimming in the water supply for the town above. Here they find, as they had hoped, life in the pitch darkness. These are hyd

发表于:2018-12-26 / 阅读(63) / 评论(0) 分类 自然百科2009年

(WA) One reason oceanographers analyze the sediment on the ocean floor is to see how long-terms changes in Earth's temperature have affected the depth of the ocean. By analyzing the remains of sea animals in old layers of ocean sediment, oceanograph

发表于:2018-12-30 / 阅读(53) / 评论(0) 分类 托福听力短文

Mars Rover Finds Evidence of Ancient Sea David McAlary The U.S. space agency NASA says Mars once had a shallow, salty sea that could have supported life. The evidence has come from chemical and physic

发表于:2019-01-04 / 阅读(60) / 评论(0) 分类 VOA2004(上)--各类新闻

It seemed like a good ideabecause rivers and ponds in Bangladesh were contaminated with bacteria, Bangladeshis switched to wells. But soon after, in the early 80s, researchers realized those wells were harming Bangladeshis with a new poisonarsenic. T

发表于:2019-01-08 / 阅读(86) / 评论(0) 分类 Scientific American(十一)月

Many Life Forms Discovered Deep under Antarctic Ice 南极冰层下发现许多形式的生命 Scientists from the United States say they have found fish and other aquatic creatures living under icy waters in Antarctica. They made the announcement af

发表于:2019-01-12 / 阅读(82) / 评论(0) 分类 2015年VOA慢速英语(三)月

Lake Sediment Could Better Date Ancient Finds Radiocarbon dating is the best-known and most widely used method to determine the age of organic material, such as bone or wood or plant matter. All such material contains radioactive carbon atoms, known

发表于:2019-01-14 / 阅读(74) / 评论(0) 分类 VOA标准英语2012年(十月)

Very quietly I take my leave As quietly as I came here; Quietly I wave good-bye To the rosy clouds in the western sky. The golden willows by the riverside Are young brides in the setting sun; Their re

发表于:2019-01-19 / 阅读(133) / 评论(0) 分类 阅读空间

These huge tracks of rainforest close to the Queensland coast are essential because they regulate the flow of water and the sediment it contains. Thats important, because theres an awful lot of water here. Hot humid tropical air gives rise to vast am

发表于:2019-01-22 / 阅读(70) / 评论(0) 分类 自然百科2014年

淡水FRESHWATER 淡水资源Freshwaterresources 谈水保护Conservationoffreshwater 水坝Dams 冰Ice 湖泊Lakes 自然排水系统Naturaldrainagesystems 河流流域开发Riverbasindevelopment 河流

发表于:2019-02-02 / 阅读(82) / 评论(0) 分类 英文语法词汇

首先,我建议同学们不要上完辅导班就去参加考试。虽有趁热打铁之说,但是我相信绝大部分同学在上课期间已经把大部分的精力用于听讲和记笔记了,回家之后基本上就直奔安乐窝了。能够

发表于:2019-02-14 / 阅读(95) / 评论(0) 分类 雅思英语

21 Life Goes On 第二十一章 生命在前进 It isn't easy to become a fossil. 要变成化石可不容易。 The fate of nearly all living organismsover 99.9 percent of themis to compost down to nothingness. 几乎所有的生物其中的99.9%以上

发表于:2019-02-17 / 阅读(72) / 评论(0) 分类 万物简史

Saying Good-bye to Cambridge Again --by Xu Zhimo 再别康桥 徐志摩 Very quietly I take my leave As quietly as I came here; Quietly I wave good-bye To the rosy clouds in the western sky. The golden willows by the riverside Are young brides in the

发表于:2019-02-18 / 阅读(101) / 评论(0) 分类 阅读空间

如何在托福阅读中提取句子的主干?这样即抓住了阅读的重点,也节省了阅读时间。有些同学对于分析长难句并不是那么敏感,看到句子简化题可能就会有晕头转向的感觉,在这里给大家讲解一

发表于:2019-02-18 / 阅读(59) / 评论(0) 分类 托福英语

近来在所接触到的考生当中,绝大部分都是准备到海外读语言、预科或是对雅思分数要求不高的准大学留学生。在他们身上都有着一个共同的特点,那就是时间比较紧迫且对雅思分数要求并不

发表于:2019-03-04 / 阅读(105) / 评论(0) 分类 托福英语
学英语单词
adiabatic ignition time
advs
agate spatula
allodelphite
antisplash guard
aperiodic balance
aquatic vascular bundle plant
benzene polycarbonic acid
Bernard, L.
bidge
C battery outfit
capillaria felis cati
cerodecyte
chodas
coelomic split
constant-current transformet
cyclic price movements
Davey Jones
decantation washing
denematize
digital input group voltage
dioctahedral
double face planer
dress-sense
droit au travail
drop stone
dumb ass
ejection orbit
electrical thread
escop
eventologically
every dog is a lion at home
expected profit
family winteraceaes
far-easts
focused synthetic array
Fremont L.
ft value ft
fuel slug
fused magnesium phosphate
general purpose digital computer
grandcousin
grid control tube
Hallington
Hawkesbury I.
inch module
ingushetiya (ingush)
IRONMAN language requirement
joest
juice a cow
Kisel'nya
label descriptor
Lactarius sanguifluus
landing distance
lendable
manuscr
marine tactical air control system
massive ore deposit
mirror finishing
nondistorted
oblique rotation
open-ended control
osae
painting under water
panchromatic negative
parn
penal servitude for life imprisonment
Phaeacians
procladius lacteiclava
PYRIMITHAMINE
qabbani
Quadraeculina
queerish
relational database capability
resacralized
running into wrong track
scheduled down tine
self-important
silverhill
Sinarquist
single sign - on
slagging resistance
snarfling
social movement
species constellation
spider silk
standardized work
stokols
sturm-ruger
switch lead
teshirogitlite
Theatines
Tivano
tungstatian
under-rented
uniformly continuous linear operator
unintended consequence
untriggered
viaziga
visual flight rules
wrong font
wyell