名词
中文翻译：粗糙的凹槽
同义词：
['rough groove', 'coarse notch', 'rough indentation']
例句：
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1. Thecarpenter used a coarse groove to mark the wood.
木匠用粗糙的凹槽来标记木头。
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2. The old map had many rough grooves that were difficult to read.
旧地图上有很多难以辨认的粗糙凹槽。
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3. The sculpture has a rough groove running down its center.
这件雕塑有一个沿着中心的粗糙凹槽。