There is evidence that all modem turtles are descended from a terrestrial ancestor which lived before most of the dinosaurs.
有证据表明所有现代海龟都有陆生的祖先，他们比大部分恐龙还古老。
Some researchers have argued that speciation rates, both terrestrial and marine, could be much higher in the tropics, making them a "cradle" of biodiversity.
一些专家认为，在热带地区的陆地和海域，物种形成的机率更高，这样就使热带地区成为了生物多样性的摇篮。
Whales and dolphins have been found with hind limbs; this rare occurrence is due to the reemergence of a trait they inherited from their terrestrial ancestors.
发现鲸和海豚身上有后肢；这种稀有的现象是由于它们在陆地上的祖先身上的特征再次被遗传。
Topographically, we may consider the coastal plain to be a terrestrial analog of the continental shelf.
从地形角度讲我们可以把沿岸平原看成是大陆架在陆上的类似构造。
For instance, whales and dolphins have been found in nature with hind limbs; this rare occurrence is due to the reemergence of a trait they inherited from their terrestrial ancestors.
比如说，鲸和海豚身上有后肢；这种稀有的现象是由于它们在陆地上的祖先身上的特征再次被遗传。
The signals are delivered via terrestrial and satellite broadcasts, a far more efficient approach than sending individual data streams to each viewer's handset, as is mostly done in other countries.
与其他国家大多的做法不同，电视信号通过地面和卫星传送，比直接向个人的手机上发送数据流的方法效率高得多。
It's a gharial, perhaps the largest terrestrial carnivore ever to walk the earth, larger than T-Rex.
这是一条长吻鄂，可能是地球上有史以来最大的陆地食肉动物，比霸王龙还要大。
When plants pioneered the land, they faced a range of challenges posed by terrestrial environments.
当植物开辟土地时，它们面临着陆地环境带来的一系列挑战。
But that makes it easier to identify something as a meteorite, as opposed to just a terrestrial rock.
但是，这使得我们更容易将东西识别为陨石，而不仅是地面的岩石。
You might think, therefore, that modem land tortoises have probably stayed on land ever since those early terrestrial times, as most mammals did after a few of them went back to the sea.
因此，你可能会想，现代陆龟可能从早期的陆栖时代就一直呆在陆地上，就像大多数哺乳动物，他们中的一些返回海洋之后所做的那样。
Nevertheless, a good number of thoroughgoing land animals later turned around, abandoned their hard-earned terrestrial re-tooling, and returned to the water again.
尽管如此，后来还是有相当数量的完全陆生动物做出改变，离开了它们辛辛苦苦重新改造的陆地，并回到了水里。
The scale of the searches has been increased dramatically since 1992, when the US Congress voted NASA $10 million per year for ten years to conduct a thorough search for extra-terrestrial life.
自1992年，美国国会计划在未来10年里每年为美国国家航空航天局投入1,000万美元，用于彻底搜寻外星生命体以来，搜寻的规模开始大幅增长。
Constant variations in the amount of sunlight available on Earth at any given location make energy storage a necessary design feature of terrestrial solar-energy systems.
在地球上任何一个特定地点，阳光的不断变化使能量储存成为地球太阳能系统的一个必要设计特征。
The largest terrestrial planet, Earth has a diameter only one quarter as great as the diameter of the smallest Jovian planet, Neptune, and its mass is only one seventeenth as great.
最大的类地行星地球的直径仅仅是最小的类木行星海王星的四分之一，而且地球的质量仅仅是其质量的十七分之一。
But the rock is reasonably widespread, being both the underlying stuff of ocean floors and a common outpouring of terrestrial volcanoes.
但是，这种岩石还是相当广泛，因为它既是海床基本物质，也是常见的陆地火山喷发物。
Through the atmosphere, all parts of terrestrial ecosystems, forests, grasslands, are linked in a very effective way.
通过大气层，陆地生态系统的所有部分，森林，草原被有效地联系起来。
The fossil snake from Argentina is also thought to have lived on land, since it was found in what was once a terrestrial environment.
阿根廷的蛇化石被认为生活在陆地上，因为它是被认为陆地环境的地方发现的。
She's also interested in determining what conditions other than a liquid ocean might help initiate life on a terrestrial planet.
她也有兴趣找出什么样的环境比陆地行星上的液体海洋更能有助于产生生命。
So as aquaculture's fishmeal needs grow, competition with terrestrial livestock for a limited resource will intensify, with ramifications for both price and availability.
因此，随着水产养殖对鱼粉需求的增加，与陆地畜牧业争夺有限资源的竞争将会加剧，对价格和供应都将造成影响。
Call me lazy, but my idea of terrestrial travel is to remain in a vehicle until the road runs out and only then to start walking.
你可以说我懒，不过，我认为，陆地旅行就要一直待在车里，直到无路可走，再开始步行。
Serves on the board of family's Future TV, a satellite and terrestrial television network covering the Middle East.
目前他还负责家庭未来电视-一个覆盖中东地区的卫星和地面电视网络。
IS IT an aquatic car or a terrestrial boat?
它到底是一辆水上汽车呢，还是一艘陆地小艇呢？
Monochromatic vision is very rare among land species, because color vision is a tool for survival in terrestrial habitats.
单色视觉能力在陆地生物中非常罕见，因为分辨颜色的能力是陆地生物生存的一项工具。
"When we try to find a definition for life, in most cases, such a definition is more a summary of the specific properties of terrestrial life," Leitner said.
“大多数情况下，我们对生命下的定义更像是对地球上已知生命形式所具有特性的总结。”莱特纳说。
The astronaut admitted that he had needed a little help from a familiar terrestrial product: he had stuck the soles of his feet to the carpet with adhesive tape.
这位宇航员承认，他需要我们熟悉的一种陆地产品的帮助：他要用胶带把脚板固定在飞毯上。
Moon rocks show that lunar water has more heavy hydrogen than does terrestrial water, indicating a cometary origin.
研究表明，月球岩石中的水资源比地球水资源包含更多的重氢元素，意即月球水有可能来源于彗星。
Moon rocks show that lunar water has more heavy hydrogen than does terrestrial water, indicating a cometary origin. Christopher Intagliata reports The Apollo moon missions ended almost 40 years ago.
研究表明，月球岩石中的水资源比地球水资源包含更多的重氢元素，意即月球水有可能来源于彗星。
Flying over 700 km above the Earth onboard the Terra satellite, MODIS provides an integrated tool for observing a variety of terrestrial, oceanic, and atmospheric features of the Earth.
该装置由运行在距地表700km的轨道上的Terra卫星搭载，MODIS有一套综合性的工具，能够观察和记录地球上陆地、海洋及大气的特征。
Since forests hold half of all terrestrial carbon, this presents a huge threat.
森林中包含着地球上一半的碳资源，形成了巨大威胁。
They are a crucial terrestrial group and we would face mass starvation without them.
它们是重要的陆地生物组，如果没有蜜蜂，我们将面对大规模饥荒。
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