名词中文翻译1
中文翻译：Unknown
同义词：
['stamp mark', 'punched mark', 'perforation mark']
例句：
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1. This isa punch mark on the wall.
这是墙上的一个打孔标记。
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2. The stamp mark on the envelope indicates that it has been opened.
信封上的打孔标记表明它已经被打开过。
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3. The perforation mark on the metal door shows that it has been opened.
金属门上的穿孔标记表明它已经被打开过。