而且还要检查一下镜子后部水银处是否有内衬纸和背板，因为没有背板就是不合格的，而且没纸也不行，这样是会把水银磨掉。

But also to check whether the mercury mirror rear inner liner and a backplane, because there is no backplane is unqualified, and no paper is not good, so is the mercury will wear off.

youdao

而且还要检查一下镜子后部水银处是否有内衬纸和背板，因为没有背板就是不合格的，而且没纸也不行，这样是会把水银磨掉。

But also to check whether the mercury mirror rear inner liner and a backplane, because there is no backplane is unqualified, and no paper is not good, so is the mercury will wear off.

youdao