名词
中文翻译：同心圆凹槽
同义词：
['concentric ridge', 'concentricindentation']
例句：
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1. Thecar's engine has a concentricgroove for the spark plug.
这辆车的引擎有一个为火花塞设计的同心圆凹槽。
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2. The machine tool has a concentric groove that allows it to rotate smoothly.
这台机床有一个同心圆凹槽，使得它能够平滑地旋转。
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3. Thegearbox has a concentric groove thathelps to distribute the load evenly.
齿轮箱有一个同心圆凹槽，有助于均匀分配负载。