Definition: to make something begin to happen Level: C1
某些医疗状况会引发过敏反应。
Certain medical conditions can ___trigger allergic reactions.
巨大的噪音在人群中引发了恐慌。
The loud noise ___triggered a panic in the crowd.
经济变化常常引发社会动荡。
Economic changes often ___trigger social unrest.
