他已经学会了如何处理小的危险，如何保护环境。
He has learned how to deal with small dangers and how to protect the environment.
我刚刚读了一本书，书中给了我们如何保护环境的建议。
I've just read a book which gives ideas about how we can protect the environment.
我刚刚读了一本书，书中给了我们如何保护环境的建议。
I've just read a book which gives ideas about how we can protect the environment.
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