whirr

v.发出呼呼声；使呼呼作响

n.呼呼声

=whir.

The bird flew past, its wings whirring. 那只鸟飞了过去，翅膀发出呼呼的声音。

The clock began to whirr before striking the hour. 钟在打点前先嘎啦嘎啦地响起来。

She heard nothing but the chirps and whirr of insect. 除了虫的鸣叫声外，她什么也没听见。