原文已被隐藏，你可用 快捷键 - 或点击 显示原文 按钮来查看原文
第1段
1 .This is Scientific American 60-Second Science. I'm Cynthia Graber.Got a minute?
该句暂无译文！
2 .Microbial organisms live in you, on you, in soil, in clouds and below the ocean floor.
该句暂无译文！
3 .That last batch of single-celled critters is particularly hard to study.
该句暂无译文！
4 .Not only are the samples difficult to obtain, but they can easily be contaminated with all that other microbial life once we dig them up.
该句暂无译文！
5 .So researchers had to take special precautions when they investigated microbial life in a coal bed deep below the seafloor near Japan.
该句暂无译文！
6 .This material was once dry land, but got submerged some 20 million years ago.
该句暂无译文！
7 .The research team drilled nearly 2,500 meters below the seafloor and brought up samples.
该句暂无译文！
8 .They carefully avoided contamination and evaluated only the inner portions of the samples, which were protected by the outer parts.
该句暂无译文！
9 .Analysis found life tenaciously holding on well under the ocean.
该句暂无译文！
10 .A gram of rich garden soil can hold a billion bacteria, at 2,500 meters below the seafloor a gram of sediment might be home to just a single microbe.
该句暂无译文！
11 .And those deeply buried organisms are quite different from microbes to be found just under the seafloor.
该句暂无译文！
12 .In that deep layer, the microbes are most closely related to bacterial groups that thrive in forest soils on land.
该句暂无译文！
13 .The scientists thus suggest that the deeply buried undersea microbes might be descendants of ones that survived when their terrestrial habitat became flooded.
该句暂无译文！
14 .Again, that was 20 million years ago.
该句暂无译文！
15 .The finding is in the journal Science.
该句暂无译文！
16 .In a commentary in the same issue, Julie Huber of the Marine Biological Laboratory at Woods Hole says the fact that there's "a massive buried biosphere" has global importance "with sub-seafloor microbes playing a crucial role in carbon sequestration...and Earth's evolution,
该句暂无译文！
17 .and likely encompassing staggering metabolic and genetic diversity."
该句暂无译文！
18 .She adds, "We still have a long way to go in uncovering and understanding microbial life deep beneath the seafloor."
该句暂无译文！
19 .Thanks for the minute, for Scientific American 60-Second Science.I'm Cynthia Graber.
该句暂无译文！