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
Good morning.
早安。
Every man is the son of his own works.
种瓜得瓜，种豆得豆。
One of the most colourful figures in boxing history was Daniel Mendoza, who was born in 1764.
拳击史上最引人注目的人物之一是丹尼尔。门多萨，他生于1764年。