metal cation的用法和樣例：
例句
- Hardness is caused by divalent metallic cations.
硬度是由一些兩價金屬陽離子引起的。 - 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，離子交換蒙脫石中吸附水的存在狀態和數量明顯地依賴於其可交換金屬陽離子的水合能力和交換數目。
