Some toxicants and injurants may emit from decorative materials and cause gaseous pollutants so that indoor air pollution has been one of the most concerned environmental problems.

室内装修材料会释放多种有毒有害化学物，室内空气污染是当今人们关注的重要环境问题之一。

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When submerged, they're also able to emit signals from depths of 20,000 ft.

潜入水中后，它们仍能从2万英尺深处发射信号。

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This evidence is far from adequate, however, since over the last decade a substantial number of new industrial facilities that emit these pollutants have been built.

然而，这一证据还远远不够，因为在过去的十年中，已经建造了大量排放这些污染物的新工业设施。

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It would allow businesses to buy licenses to emit greenhouse gases from other firms that use less energy.

VOA: standard.2009.05.30

Faced with these competitive pressures, BASF may make the best of a bad situation by buying and selling the right to emit carbon from one of several new European markets.

FORBES: Magazine Article

The spawning process takes about 45 minutes, during which a female will emit anywhere from 10, 000 to around 60m eggs, only a small fraction of which will be lucky enough to meet their mates.

ECONOMIST: A dozen ocean-cleaners and a pint of Guinness, please

The permits for big firms to emit CO2 will be auctioned from 2013 (at the moment, they are given away).

BBC: NEWS | Science/Nature | Germany leads 'clean coal' pilot