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Some are looking to clean their air of conventional pollutants, which could encourage some companies to switch to low - or no-carbon alternatives.

有些国家准备将传统污染物从空气中清除出去，这将鼓励一些公司转移到低碳或无碳替代方案上来。

youdao

For the majority of those Americans who get their television free over the air, this will be the big switch-off.

对大多数免费收看开路电视的美国人来说，这个关停影响巨大。

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At the set time, the room's lights and air-conditioning switch on automatically.

CNN: ASIANOW - Asiaweek

Surface-to-air missile sites and fighter aircraft, for example, reveal their location as soon as they switch on their radar transmitters to look for targets.

ECONOMIST: Remote sensing