名词
中文翻译：硫化斑痕
同义词：
['sulfur stain', 'sulfide stain例句：1. The old painting had a faint sulphide stain on the back.（这幅旧画背面有淡淡的硫化斑痕。）2. The scientist used a special chemical to remove the sulphide stain from the sample.（科学家用一种特殊的化学物质从样本中去除硫化斑痕。）']
例句：
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1. The old painting had a faint sulphide stain on the back.
这幅旧画背面有淡淡的硫化斑痕。
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2. The scientist used a special chemical to remove the sulphide stain from the sample.
科学家用一种特殊的化学物质从样本中去除硫化斑痕。
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3.The sulphide stain on the wall was caused by a recent flood.
墙上的硫化斑痕是由最近的洪水造成的。