空调发出持续的嗡嗡声，让我难以入睡。

The air conditioner kept ___thrumming all night, making it hard for me to sleep.

她靠在窗边，随意地拨弄着尤克里里的琴弦。

She leaned against the window, ___thrumming the strings of her ukulele absentmindedly.

音乐厅里洋溢着观众热切的期待。

The concert hall was ___thrumming with the audience's eager anticipation.