一些科学家推测,火星在早期很长时间里可能都有以河流、湖泊,甚至海洋装点着它的表面。
Some scientists speculate that Mars may have enjoyed an extended early period during which rivers, lakes, and perhaps even oceans adorned its surface.
为了消除这种杂草,生物学家建议用某种对人类和水生动物无毒的除草剂来处理受感染的部分湖泊。
In order to eliminate the weed, biologists proposed treating infested parts of the lake with a certain herbicide that is nontoxic for humans and aquatic animals.
美国科罗拉多大学的研究小组称,科学家发现的湖泊距今已有34亿年历史,占地80平方英里,深达1500英尺。
The lake, which dates back some 3.4 billion years, appears to have covered as much as 80 square miles and was up to 1, 500 feet deep, said the team from the University of Colorado.
美国科罗拉多大学的研究小组称,科学家发现的湖泊距今已有34亿年历史,占地80平方英里,深达1500英尺。
The lake, which dates back some 3.4 billion years, appears to have covered as much as 80 square miles and was up to 1,500 feet deep, said the team from the University of Colorado.
科学家把地球上可饮用的淡水——包括湖泊、河流和蓄水层的水统称为“深海”,人类每一年能够使用大约三分之一的“深海”。
Of all the fresh water accessible in lakes, rivers and aquifers — what scientists call “blue water” — humankind uses about one-third every year.
这组科学家说,气候变化可能影响内陆湖泊的温度、珊瑚礁的健康以及海洋营养的循环。
Climate change can affect the temperature of inland lakes, the health of reefs and how nutrients circulate in the oceans, the researchers say.
美国和瑞士的科学家研究了非洲湖泊中的棘鳍类热带淡水鱼。
Scientists in the U.S. and Switzerland were studying the cichlids that live in African lakes.
从传回地球的数据分析,科学家们了解到漫游者降落在一个几百米深的沉积堆上,而这个沉积堆一定是在一个古老的湖泊中形成的。
From data sent back to Earth, scientists know that the rover landed on several hundred metres of sedimentary deposits that must have formed in ancient lakes.
科学家在研究员盖迪阿希尔指导下,说发现了一个古老的深湖泊,暗示着这个红色的星球上过去存在过生命。
The scientists, led by researcher Gaetano di Achille, said the finding is an indication of a deep, ancient lake, with implications for the discovery of past life on the Red Planet.
生物学家已经发现,夏末时节,北美及欧洲河流湖泊里的淡水鳗鱼会远迁到大西洋中部聚集。
Biologists have discovered freshwater eels from North American and European rivers and lakes gathering as far as the middle of the Atlantic ocean during late summer.
但是科学家发现印度的湖泊完整地保存了昆虫,使研究人员能够仔细地研究其整体。
However, scientists have found that the Indian amber preserves the insects intact, allowing the researchers to study them whole in fine detail.
生态学家成功地研究了一些岛屿和湖泊,其研究结果相当完备,他们可以根据那些研究结果推测自然界其余部分的状况。
Ecologists have had some success studying islands and lakes, which are fairly self-contained, and extrapolating those findings to the rest of the natural world.
为了从时间上定位这些动物走向灭绝的过程,科学家检测了印第安那一片湖泊中的沉积物。
To date the animals' slide to extinction, the scientists examined sediment cores from a lake in Indiana.
科学家们在上一个科考季发现,受到高处冰川径流的影响,这里的湖泊水位上升到了前所未有的水平。
During this past research season the scientists recorded unprecedented lake levels caused by higher glacial runoff.
生态学家非常担心持续干旱会对湖泊的生态系统和整个长江流域造成严重后果。
Ecologists are very worried about the serious consequences of the continuous drought on the Eco system of the lakes as well as the whole Yangtze River Valley.
一直在长江和相邻湖泊生活长达两千多万年的江豚和淡水海豚,科学家们估计它们在15年内将会灭绝。
Scientists estimate that the finless porpoise, a freshwater dolphin which has lived in the Yangtze River and adjacent lakes for over 20 millions years, will become extinct within 15 years.
和导游书作者的声明(是为了增加戏剧性、神秘感和悬念等等)相反,事实上,科学家确实清楚为什么湖泊看起来就是它们这样子。
Contrary to guidebook authors claims (which aim to increase drama, mystery, suspense, etc), scientists do in fact understand why the lakes looks like they do.
科学家们曾经相信那个时代的火星湖泊中只有冰,所以这个发现拓宽了那个时代,可能一些现在已经灭绝的生物在那个时代生活在火星上。
Scientists have previously believed that the lakes on Mars during that period were merely ice so the findings widen the period of time in which now extinct life forms could have existed on Mars.
科学家们猜想这种动物生活在湖泊和河流中。
Scientists supposed that the animal lived in lakes and rivers.
但是,在人类学家第一次开始记录这个部落的习俗后,关于他们的特殊文化和美丽湖泊的消息就传开来了。
But after anthropologists first started to document the tribe's customs, word got out about the uniqueness of their culture and the beauty of the lake.
英国科学家表示,火星上的古湖泊中曾经有生命存在。
Ancient lakes on the planet Mars may once have hosted life scientists in Britain have said.
科学家们说是由于全球气候变暖导致冰川快速融化从而使湖泊注满,水位升高。
Scientists say global warming makes glaciers melt fast and lakes get filled up.
同时,科学家们发现,一种在山间湖泊里产卵的物种——蝾螈——的种群数量已出现减少。
At the same time, scientists have discovered, the population of a species of salamander that lays its eggs in mountain lakes has declined.
美国国家航空航天局的科学家们称火星曾被巨大的湖泊、流动的河流以及其他潮湿的自然环境所覆盖,而这些都使其有了维持生命的可能。
NASA1 scientists said that Mars was covered once by vast lakes, flowing rivers and a variety of other wet environments that had the potential to support life.
科学家们说,在美国和加拿大成千上万个湖泊中的动植物都已经因酸雨而死亡。
Scientists say that plant and animal life in thousands of lakes in the United States and Canada has already been destroyed by acid rain.
但是在2006年,生态学家发现少量潜鸭居住在马达加斯加北部一个偏远的湖泊。
But in 2006, biologists spotted just a few of them living on a remote lake in Northern Madagascar.
但是在2006年,生态学家发现少量潜鸭居住在马达加斯加北部一个偏远的湖泊。
But in 2006, biologists spotted just a few of them living on a remote lake in Northern Madagascar.
应用推荐