1. Impress or fix sth permanently 
   使某事物铭记或牢固附著
2. A part, as of a telephone receiver or hearing aid, that fits in or is held next to the ear. 
   耳塞电话接收器或助听器上嵌入耳中或附著在耳上的部分
3. He went to sleep over his work. 
   他干著干著活儿就睡著了。
4. Most classical music sends me to sleep. 
   古典音乐我大多听著听著就睡著了。
5. If you can't answer the question, leave a blank. 
   如果答不上来就空著。

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