underdrain
/'ʌndədrein/
danh từ
- ống thoát ngầm; cống ngầm
Định nghĩa tiếng Anh
n. An underground drain or trench with openings through\n which the water may percolate from the soil or ground above.\nv. t. To drain by forming an underdrain or underdrains in;\n as, to underdrain land.