"whir of a bird's wings" "the whir of the propellers"
"the motor whirred" "the car engine purred"
The..marsh-birds rose again..with a simultaneous whirr.
The only sound is the whirr of moving-picture cameras.
Bats were whirring about.
牛津高階第八版
美國韋氏詞典
Dictionary.com
Free Dictionary
維基百科 (自由的百科全書)