Any escape, once it's detected, sets off the alarm. [VERB PREP. noun]
一旦发现有泄漏,警报就会响起来。
Someone set off a fire extinguisher. [VERB PREP. noun (not pronoun)]
有人打开了灭火器。
It could take months before evidence emerges on how the bomb was made, and who set it off. [VERB noun PREP.]
关于炸弹是如何制造的以及是谁引爆的,可能需要几个月时间才会有证据浮出水面。
See also: set off
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