Underdrainage
n. 暗渠排水, 地下排水
🗣️ 情景例句
What if we can't tie the tie?
如果我们弄不好领结怎么办？
Ok, bye-bye.
好吧，再见。
I can't see. I think they're in her pencil-box.
我看不到。我想大概在她的铅笔盒里。