n.氧化鎂;苦土
The hardness of water depends upon the amount of salts of lime and magnesia which it contains. 水的硬度是由其含石灰鹽和氧化鎂的數(shù)量決定的。
Magnesia lime is an ideal lime for construction. 苦土石灰是一種不錯的建筑用石灰。