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Hardness is caused by divalent metallic cations.是什么意思？

Hardness is caused by divalent metallic cations.

硬度是由一些两价金属阳离子引起的.

相关词汇
hardness is caused by divalent metallic

hardness

n. 坚硬，<物>硬性，困难，冷酷；

is

vt.& vi. 是（be的三单形式；n. 存在；

caused

人为的；

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

divalent

adj. 二价的；

metallic

adj. 金属的，金属性的，金属制的，含金属的；
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