whirring

The whirring of the fan kept me awake all night.

用法提示：whirring 作名词，指持续的低沉转动声（风扇声）。

From the next room came a soft whirring, like a spinning wheel.

用法提示：whirring 作为名词表示呼呼声。

We could hear the whirrings of the drone as it flew over the garden.

用法提示：whirrings 是 whirring 的复数形式，表示一连串的嗡嗡声。