释义
(of a thing)fail to function properly
（某物）运转不正常
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the plane's engine was acting up. 飞机引擎运转不正常。
(of a person)misbehave
（人）行为不端。
(of a person)take over or be promoted to a more senior position, typically on a temporary basis
（人）（多指暂时）接任更高职位，擢升。