1. (人)渐渐离开：academic tenure 教员任期 | drift off (人)渐渐离开 | foreign element 外来因素
2. 漫无目的地移动：2. preach vt. 传授,讲授 | 3. drift off 漫无目的地移动 | 4. remind vt. 使想起;使记起;提醒
3. 漸漸入睡：drift away: (朋友或親人之間)漸漸疏遠 (drift) | drift off: 漸漸入睡 (drift) | drop off: 減少,下降;卸下,讓...下車;睡著 (drop)
verb
1. change from a waking to a sleeping state
e.g. he always falls asleep during lectures
Synonym: fall asleepdope offflake outnod offdrop offdoze offdrowse off