1. The rocks in this area are mainly siliceous, which makes them ideal for construction purposes.
这个地区的岩石主要是富含硅的，这使得它们非常适合建筑用途。

2. Some plants, such as horsetails, have siliceous structures that provide them with extra strength and support.
一些植物，如马尾草，具有硅质结构，这为它们提供了额外的力量和支持。