PHRASAL VERB (其他方法行不通时)转而做，转而使用，转而依靠 If you fall back on something, you do it or use it after other things have failed. (其他方法行不通时)转而做，转而使用，转而依靠
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Unable to defeat him by logical discussion, she fell back on her old habit of criticizing his speech. [VERB PREP. PREP. noun]
由于在条理上说不过他，她便转而重施故技，抓住他的演讲不放。
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When necessary, instinct is the most reliable resource you can fall back on. [VERB PREP. PREP. noun]
必要时，最保险的办法就是凭直觉判断。