This can make the flat become more flat. And you can easily find the defects exist in the ground so as to make level for the next coat construction.
此遍可使地面更趋于平整，更便于发现地面仍存在的缺陷，以便下一面层施工找平。
Ursidae that have a shaggy coat and a short tail and walk with the entire lower surface of the foot touching the ground.
熊一种通常具危险的熊科哺乳动物，有浓密的毛发和短尾巴，行走时脚的较低表面触地。
The snow still lay upon the ground, and there was a coat of ice on the water every night.
地上仍然盖着雪；每天夜里水上都结了冰。
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