它被发现是污秽的。
The son found the dirty basket had become clean.
儿子发现脏篮子变干净了。
Pigeons are often seen as dirty birds and an urban nuisance, but they are just the latest in a long line of animals that have been found to have abilities to help humans.
人们常把鸽子视为肮脏的鸟类或是城市的公害,但他们只是众多有能力帮助人类的动物中的最新一员。
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