问答题

(Line 4, Para. 3, Passage 1)
We need to know why all watersheds (水滨) need the protection of plant life and why the running current of streams and rivers must be made to yield their full benefit to the soil before they finally escape to the sea.

【参考答案】

我们必须了解为什么所有的水滨都需要植物的保护，为什么在河川的水流注入大海之前必须使其充分为土地所利用。
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