名词
中文翻译：油印标记
同义词：
['oil smudging', 'oil stain', 'oil imprint']
例句：
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1. The old map had a lot of oil marks from years of use.
这张旧地图上有很多油渍，说明它被使用了很多年。
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2. The oil marks on the wall were evidence of the fire that destroyed the building.
墙上的油迹是那场火灾的证据。
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3. The oil marks on the table were from the previous owner's dinner party.
桌子上的油迹是前任主人举办晚宴时留下的。