I see. I was talking about 进水管道 all this time.

来源: 于 2016-02-04 10:12:29 [旧帖] [给我悄悄话] 本文已被阅读：次

You and I are at completely different levels.  You can wait for a problem to happen and then solve it.  I don't have much basic knowledge to solve a problem when it comes.  I have to learn some basic things first.