名词
中文翻译：口哨
同义词：
['mouth organ', 'whistle', 'mouthpiece']
例句：
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1.The muzzle bell was used to signal the start of a race.
口哨被用来开始比赛的信号。
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2. The conductor played the muzzle bell to announce the arrival of the train.
指挥家吹响口哨来宣布火车的到来。
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3. The muzzle bell was used as a warning device during the Civil War.
在内战期间，口哨被用作警告装置。