使嗡嗡叫
Make a buzzing sound
以上为机器翻译结果，长、整句建议使用 人工翻译 。
当他不得不站在公众面前讲话时，他经常喃喃自语，像蚊子一样嗡嗡叫，使听众们都不知所云。
When he had to speak publicly, he frequently mumbled and spoke in an inaudible voice that made it very difficult for people to hear him.
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