hinge on

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释义

取决于，关键在于，依…而定(后加sth.)
to depend on, depend upon, be contingent upon

例句
Hightower: Your investigation seems to hinge on what you may have read on a bathroom wall. (The Mentalist)
海托华：你的调查都是取材于厕所墙上贴的小广告吧。（超感神探）