
名词形式是main,意思是最主要的部分、重点、主要管道,例如:
1.The main pipeline supplying water was sabotaged by rebels.供水主管道被叛乱分子蓄意破坏了。
2.So I just gotta dig a little hole in the backyard, clean out the main line.于是我准备在后院挖一个小洞,疏通主管道。

名词形式是main,意思是最主要的部分、重点、主要管道,例如:
1.The main pipeline supplying water was sabotaged by rebels.供水主管道被叛乱分子蓄意破坏了。
2.So I just gotta dig a little hole in the backyard, clean out the main line.于是我准备在后院挖一个小洞,疏通主管道。