Hardness ions
[化] (水的)硬度离子(指水中的钙、镁等离子)
🧩 词语组成解析
hardness
['hɑrdnɪs]
n. 坚硬;<物>硬性;困难;冷酷;
n. 离子（ion复数）
🗣️ 情景例句
If he says he's going to be here, he's here.
假如他说他要来这儿 他就一定会来。
If you would make an enemy,lend a man money and ask it of him again.
你若想与人结怨，只须先借钱给他，再向他催讨。
Do you think you'll be able to go to sleep right away?
你认为你马上就能睡着吗？