"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.
牛津高阶第八版
美国韦氏词典
Dictionary.com
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维基百科 (自由的百科全书)