青云翻译

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1) easy to read, you can greatly improve one's level of knowledge. 2) than light is strong. 3) last is to a certain extent promote the industrial development

正在翻译，请等待...

1) a convenient book, also can greatly improve people's knowledge. 2) than light is very strong. 3) Lastly there is to some extent, promoted industrial development

1) easy to read, you can greatly improve one's level of knowledge. 2) than light is strong. 3) last is to a certain extent promote the industrial development