SSS 2008-07-02
时间：2019-01-08 作者：英语课 分类：Scientific American(七)月
This is Scientific American's 60-second Science, I am Karen Hopkin. This'll just take a minute.
Methane 1 is a greenhouse gas that traps heat even better than carbon dioxide. It comes from a variety of sources, including fossil fuel production and even farming. Cows give off methane, you know, after they eat. Even the surface waters of the ocean contain substantial amounts of this gas. But where marine 2 methane comes from was a mystery. Until now. Scientists collected seawater off the coast of Hawaii. And they found that bacteria that live in these waters scarf up certain phosphorous-containing chemicals, and then release methane as a byproduct. The results appear online in the journal Nature Geoscience. What’s surprising is that scientists had previously 3 thought that methane is only produced by bacteria that live in places where there is no oxygen, think of the smell you associate with a swamp or with the muck at the bottom of a murky 4 pond. This marine methane could contribute to global warming by adding more greenhouse gases to the atmosphere. What’s worse, the hotter it is, the more stressed these seafaring bacteria get, and the more methane they’re likely to put out. Which was certainly not the kind of feedback that atmospheric 5 scientists were hoping to get.
Thanks for the minute,for Scientific American's 60-Second-Science.I'm Karen Hopkin.
- The blast was caused by pockets of methane gas that ignited.爆炸是由数袋甲烷气体着火引起的。
- Methane may have extraterrestrial significance.甲烷具有星际意义。
- Marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
- When the war broke out,he volunteered for the Marine Corps.战争爆发时，他自愿参加了海军陆战队。
- The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
- Let me digress for a moment and explain what had happened previously.让我岔开一会儿，解释原先发生了什么。
- She threw it into the river's murky depths.她把它扔进了混浊的河水深处。
- She had a decidedly murky past.她的历史背景令人捉摸不透。
- Sea surface temperatures and atmospheric circulation are strongly coupled.海洋表面温度与大气环流是密切相关的。
- Clouds return radiant energy to the surface primarily via the atmospheric window.云主要通过大气窗区向地表辐射能量。