This 65.5-million-year-old layer of Earth separates fossils of the Cretaceous period from those of the Tertiary period.

这个有着6550万年历史的地层分离了白垩纪的化石和第三纪的化石。

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They have covered pools of blood from the birth with a thin layer of earth and are toasting their daughter with cups of cloudy water.

他们用薄薄的地皮盖住了分娩时的血迹，举起盛满浑浊的水的酒杯庆祝女儿的诞生。

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The system is also quite effective for locating fires that are smoldering beneath the top layer of earth -- a problem that occurs with wildfires thought to have been snuffed out.

该系统还能相当有效的定位土下的无焰燃烧--也就是森林大火被认为已被扑灭而产生的问题。

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One of these satellites, CloudSat, has given the first glimpses of the middle layer of clouds in the Earth's atmosphere.

ECONOMIST: Climatology

Finally, in a third set of simulations, they doubled the CO2 in the atmosphere, but added a layer of sulfate aerosols to the stratosphere, which would deflect about two per cent of incoming sunlight from the earth.

NEWYORKER: The Climate Fixers

Nitrous oxide is also considered a greenhouse gas and is 310 times more dangerous to the Earth's ozone layer than carbon dioxide, said Joseph Johns, chief of the U.S. attorney's environmental crimes section.

NPR: Feds Raid 17 Calif. Businesses For Nitrous Oxide