chalk overlay

例句：

1. 1. The artist applied a layer of white paint to the wall.
   艺术家在墙上涂了一层白漆。
2. 2. The painter used a chalk overlay to create a smooth finish on the canvas.
   画家用粉笔覆盖物在画布上创造了平滑的完成效果。
3. 3. The engineer decided to use a chalk overlay to waterproof the concrete floor.
   工程师决定使用粉刷层来防水混凝土地板。