柯林斯词典drift off (drifting,drifted,drifts) 1. PHRASAL VERB If you drift off to sleep, you gradually fall asleep. 慢慢地睡去 It was only when he finally drifted off to sleep that the headaches eased. 当他最终慢慢睡着时，头疼才减轻了。 返回 drift off