名词
中文翻译：敲击指示器
同义词：
['knockout indicator', 'knock-out indicator']
例句：
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1. The knock-out indicator onthe doorbell is a simple way tolet someone know you're home.
门铃上的击倒指示器是一种简单的方法，可以让别人知道你在家。
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2. In sports, the knock-out indicator is usedto determine if a player has scored agoal.
在体育比赛中，击倒指标用于确定球员是否进球。
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3. Theknock-out indicator wasdesigned to prevent players from gettinginjured during the game.
击倒指标的设计是为了在比赛中防止球员受伤。