I always use earphone in one ear, to keep another one can listen other sounds.

我通常耳机只带一个耳朵，就是为了可以让另一只耳朵可以听到别的声音。

youdao

I always use earphone in one ear, to keep another one can listen other sounds.

我通常耳机只带一个耳朵，就是为了可以让另一只耳朵可以听到别的声音。

youdao