hums; hummed; humming
hums; hummed; humming
Learner's definition of HUM
1
[no object] : to make a low continuous sound发出连续低沉的声音;发出嗡嗡声 2
: to sing the notes of a song while keeping your lips closed哼曲子 [no object]
[+ object]
3
[no object] : to be very active or busy活跃;忙碌