Use high voltage gas-free spraying or roller coat to deal with the cleanness and roughness of the surface. And paint a coat with epoxy closedprimary coat paint.
在处理清洁、平整的砼表面，采用高压无气喷涂或辊涂，环氧封闭底涂料一道。
2
As the only teacher in Shaniping Primary School, which was closed because of COVID-19, Huang went to 7-year-old Zeng Yufen's home.
作为因新冠肺炎疫情而关闭的沙泥坪小学的唯一一名老师，黄老师来到了7岁的曾雨芬家。
3
To cut costs, Luochuan has closed down nearly half of its 320 primary and middle schools since 2003, resulting in lay-offs for more than 700 teachers and forcing many more children to board.