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. 儅他最終慢慢睡著時，頭疼才減輕了。 返回 drift off