droning

['drəuniŋ]

adj. 发嗡嗡声的, 声音低沉单调的
动词drone的现在分词形式

例句与用法：

Airplanes kept on droning in the distance throughout the night.

整个夜晚，远处的飞机隆隆地响个不停。

A droning, mechanical delivery of the speech.

一篇低沉单调、呆板的演说