n. a period of indeterminate length (usually short) marked by some action or condition
n. 一会儿, (一段)时间
conj. 当...的时候, 虽然
vt. 消磨
1. I like to listen to music while I study.
我喜欢在学习的时候听音乐。
2. She read a book while waiting for the bus.
她在等公交车的时候读了一本书。
3. He often takes a walk while thinking about his day.
他经常在思考自己的一天时散步。