hahaha, 老土也掏这个。。

老土是广东人吧。。

1。 3mm is not an issue. This is due to house foundation settled. If it is about 1cm, then you 'd better to pass.

2. mold. Bleach.hahaha...

find out why. If there is leaking, you need to fix it asap.

欢迎来掏这个， 老土是职场的大拿呀。