Large patios should have integral drains or proper slope design that will carry water to a low point drain.

大院子应该有不可分割的排水渠或斜坡进行适当的设计，将进行水低谷流失。

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Grates drain low point in driveway.

炉排漏，低一点的车道。

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Grates drain low point in driveway.

炉排漏，低一点的车道。

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