To make a sound without opening the lips, suggesting the sound of a prolonged m。

闭口作 m 声。

To make a buzzing noise, as a bee in flight; drone.

作嗡嗡声(如蜂鸣)。

To be in energetic motion or action.

呈活泼现象。

To sing in a low undertone.

哼唱；沉吟。

To affect or effect by humming.

以低吟致使。

The noise made by bees and insects in flying.

嗡嗡声。

The act of making a low sound.

沉吟。

A sound, followed by a pause, implying hesitation, surprise, displeasure, etc.

哼！(迟疑惊奇或不悦时所发之声)。