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
Pleased to meet you.
很高兴遇见你 。
Old wood is best to burn,old horse to ride.
老柴好烧，老马好骑。
Roy acted quickly and drove the bus straight at the thieves.
罗伊行动迅速，开车直冲窃贼而去。