名词
中文翻译：齿轮标记
同义词：
['gearing marks', 'gear scratches']
例句：
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1.The car's engine has several gear marks on it.
这辆车的引擎上有几处齿轮痕迹。
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2. The old clock had many gear marks that were hard to read.
那把旧时钟有很多难以辨认的齿轮痕迹。
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3.The mechanic inspected the gear marks on the gearbox to determine its condition.
机械师检查了变速箱上的齿轮痕迹，以确定其状况。