sand be wrapped in clay

• 包砂土

sand be wrapped in clay的用法和样例：

例句

1. Generally, sand magnifies vibration, while viscous powder soil damps vibration.
   砂土层一般起放大作用，粘质粉土层一般起减震作用。
2. In sands, a large amount of grout was required for the heave to be significant.
   在砂土层中则须注入大量浆材方可达到隆起之目的。