Underdrain
n. 阴沟, 地下沟道, 盲沟, 暗渠
🗣️ 情景例句
That's fine. Thank you.
很好。谢谢你。
A wise man thinks all that he says,a fool says all that he thinks.
聪明人想了才说，愚笨的人想着就说。
Is it on the desk?
是在桌子上吗？