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
You look as fit as a fiddle.
你看起来非常健康。
It is a mistake to trust him.
信任他是个错误。
Frank smiled when he remembered his hard early years and the long road to success.
弗兰克回想着他早年的艰难经历和走过的漫长的成功之路，微笑了。