名词
中文翻译：平滑区域
同义词：
['smooth area', 'smooth region', 'smooth zone']
例句：
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1. The car's engine is located in a smooth zone between the front and rear wheels.
汽车引擎位于前轮和后轮之间的一个平滑区域。
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2. The smooth zone between the two plates allows for easy movement.
两个板块之间的平滑区域使得移动变得容易。
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3. The engineer designed a smooth zone to reduce friction between the moving parts.
工程师设计了一个平滑区域，以减少运动部件之间的摩擦。