layer lattice mineral

例句：

1. 1. The building has several layers of floors.
   这座大楼有好几层楼。
2. 2. The layer of snow was too thick to walk through easily.
   那层雪太厚了，不容易走过去。
3. 3. The scientist found a new layer of minerals beneath the surface.
   科学家在地表下发现了新的矿物质层。