Learner's definition of DRAINAGE
[noncount]
: the act or process of draining something : the act or process of removing water or liquid from a place or thing排水;放水 -
the drainage of swamps沼泽地的排水
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The soil has good drainage. [=extra water does not stay in the soil]这块地排水良好。
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The holes in the bottom of the flower pot are for drainage. [=are for the extra water to flow out]花盆底部的洞是用来排水的。
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often used before another noun常用于另一名词前