chemical combination

• 化合

chemical combination的用法和样例：

例句

1. The Water has been saturated with a special chemical.
   水已被一种特殊化合物质吸收了。
2. The ratio of "dissolved oxygen"is decided by the chemical reactivity the oure metal has.
   纯金属元素与氧的化学反应活性决定了金属中化合氧和溶解氧的比率。