plastering sand

例句：

1. 1. The builders used plastering sand to smooth the surface of the walls before painting.
   建筑工人使用抹灰砂来在墙面上涂漆前平滑表面。
2. 2. The plastering sand was carefully mixed with water and applied evenly on the wall surface.
   抹灰砂被小心地与水混合，并均匀地涂抹在墙面上。
3. 3.The plastering sand is essential for creating a smooth finish on the walls during the construction process.
   抹灰砂是施工过程中创造墙面光滑表面所必需的。