化学渗透作用的

例句：

1. 1. Chemical reactions occur when substances come intocontact with each other.
   化学反应发生在物质相互接触时。
2. 2. The chemical composition of the samplewas determined by X-ray diffraction.
   通过X射线衍射确定了样品的化学成分。
3. 3. The chemical properties of waterare essential for life on Earth.
   水化学性质对于地球上的生命至关重要。