高沟

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1.

Extra care must be taken to be sure that water does not cut through any of the ridges between contour furrows.

要格外细心以确保水流不会穿越等高沟间的田埂。

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2.

Contour furrows overcome this problem because they are placed on a gradient of about 0 . 5 % across the main slope.

等高沟克服了这个问题，因为这些沟垂直于主坡方向布置，沟道坡度约为 0 .

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