to sing a tune with your lips closed 哼（曲子）When you hum, or hum a tune, you sing a tune with your lips closed.
[I] to be full of activity 活跃；繁忙
The streets were beginning to hum with life.
to sing a tune with your lips closed 哼（曲子）When you hum, or hum a tune, you sing a tune with your lips closed.
[I] to be full of activity 活跃；繁忙
The streets were beginning to hum with life.