面必须坚固、干净、平整，无油污、浮尘以及其它松动物。

The base surface must be sound, clean, smooth, no oil, dust and other loose animals.

youdao

面必须坚固、干净、平整，无油污、浮尘以及其它松动物。

The base surface must be sound, clean, smooth, no oil, dust and other loose animals.

youdao