while

Please keep quiet while the students are taking their final exam in the hall.

(Chinese) 当学生们在大厅参加期末考试时，请保持安静。

I like to listen to classical music while I am cooking dinner for the family.

(Chinese) 我喜欢在为家人做晚饭的时候听古典音乐。

I haven't seen my cousin in a long while, maybe over three years.

(Chinese) 我有很长一段时间没见到我的表兄了，大概有三年多。

Let's sit down for a while and enjoy the sunset before heading home.

(Chinese) 在回家之前，让我们坐一会儿，欣赏一下日落。