名词
中文翻译：繁忙的中继器同义词
同义词：
['busy switch', 'busy relay']
例句：
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1. The bus is so crowded that it's a real challenge to find a seat.
公交车太拥挤了，找座位真是个挑战。
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2. The busy city streets are always bustling with activity.
繁忙的城市街道总是充满活力。
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3. The busy engineer had to work overtime to meet the deadline.
忙碌的工程师不得不加班以满足截止日期。