dirty, foul, nasty
这些形容词均有“脏的，污秽的，下流的”之意。
dirty : 普通用词，泛指被玷污或弄脏。
They were telling dirty stories.（他们在讲下流故事。）
foul : 指由于腐烂、恶臭等造成的不干净，令人恶心。
The house was filled with foul odour.（房间里充满了难闻的气味。）
nasty : 主要指特别讲究清洁的人感到讨厌的东西。
Try to get rid of your nasty cold.（想法除去你那讨厌的感冒。）
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