一边

In a sentence

• 他一边吃饭，一边看书。

  He is eating while reading a book.

  The word '一边' is used to indicate that two actions are happening simultaneously, in this case eating and reading.

• 他们喜欢一边散步，一边聊天。

  They like to walk while chatting.

  The term '一边' shows that walking and chatting are done concurrently and in a habitual manner.

• 我一边听音乐，一边完成作业。

  I complete my homework while listening to music.

  Here, '一边' is used to describe the multitasking of listening to music and doing homework.