whirr
verb [ I ] mainly UK (US usually whir -rr-) uk/wɜːr/ us/wɝː/
（尤指机器）发出嗡嗡声，发出低沉持续的声响
(especially of machines) to make a low, soft, continuous sound
I could hear the washing machine whirring in the kitchen. 我能听见厨房里洗衣机的嗡嗡声。
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