Underdrainage
n. 暗渠排水, 地下排水
🗣️ 情景例句
Millie, did you bring the tapes for dancing?
Millie，带来了跳舞的录音带吗？
He who would climb the ladder must begin at the bottom.
爬梯必须从底层开始。
No, sir, I always walk this way.
不，先生，我一直是这样走路的呀！