To do so, he does not cause surface layer and cement mortar is inconsistent, surface water mud too much, easy to the problem of craze.
这样做，就不致造成表面与里层砂浆配合比不一致，表面水泥浆太多，易于开裂的问题。
Wipe the surface very thick, use high-grade cement mortar, high strength, this is wrong.
面层抹得很厚，用上高标号水泥，高强度砂浆，这就错了。
All that is needed on rock is a little concrete or mortar to make the surface level.
在基岩上所需要做的全部工作是用少量混凝土或砂浆把表面找平。
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