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雨水是一种最根本、最直接、最经济的水资源,是自然界水循环系统中的重要环节。
Rainwater is a kind of economical resources, and it is a important link in water circulation system.
youdao
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雨水是一种最根本、最直接、最经济的水资源,是自然界水循环系统中的重要环节。
Rainwater is a kind of economical resources, and it is a important link in water circulation system.
youdao