underdrain的翻译，读音
英/'ʌndәdrein/
释义：
n. 阴沟, 地下沟道, 盲沟, 暗渠
n. An underground drain or trench with openings through
which the water may percolate from the soil or ground above.
v. t. To drain by forming an underdrain or underdrains in;
as, to underdrain land.
n. An underground drain or trench with openings through
which the water may percolate from the soil or ground above.
v. t. To drain by forming an underdrain or underdrains in;
as, to underdrain land.