英文英文字典
英文英文字典
古腾堡计划中的在线英语-英语词典
结果
Underdrain的结果
Underdrain
(n.)
An underground drain or trench with openings through
which the water may percolate from the soil or ground above.
Underdrain
(v. t.)
To drain by forming an underdrain or underdrains in;
as, to underdrain land.