Forepoling
超前支护
🗣️ 情景例句
There are several tours of the Grand Canyon.
到大峡谷有好几个旅游团。
Do you live up the street?
你在街头居住吗？
This platform would serve as a port and a railway station.
如果再建些伸出海面的高大的烟囱状通风管，