名词
中文翻译：循环器
同义词：
['circulator', 'maglev train']
例句：
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1. The circulator is a crucial component in the transportation system.
循环器是交通系统中至关重要的组成部分。
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2. The maglev train is the fastest mode of transportation in the world.
磁悬浮列车是世界上最快的交通工具。
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3. The circulator and maglev train are both environmentally friendly modes of transportation.
循环器和磁悬浮列车都是环保的交通工具。