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沼澤地的排水
-
The soil has good drainage. [=extra water does not stay in the soil]這塊地排水良好。
-
The holes in the bottom of the flower pot are for drainage. [=are for the extra water to flow out]花盆底部的洞是用來排水的。
—
often used before another noun常用於另一名詞前