metal cation的用法和样例：
例句
- Hardness is caused by divalent metallic cations.
硬度是由一些两价金属阳离子引起的。 - The results show that the amount and state of the adsorbed water are obviously correlated with the hydration power of the metal ions and the amount of exchanged metal ions.
研究表明，离子交换蒙脱石中吸附水的存在状态和数量明显地依赖于其可交换金属阳离子的水合能力和交换数目。
