as和like用在句首的区别.———radar,the laser can be used to track satellites.

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as和like用在句首的区别.
———radar,the laser can be used to track satellites.

like
as 一般引导句子,这里不是句子,就用介词like

as在句首是像.......一样,接从句,like是介词,选like

like介词,as连词

—like—radar,the laser can be used to track satellites.
—as—radar does,the laser can be used to track satellites.