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
How long will it take for my mail to reach its destination?
我的信件到达目的地要多久？
I couldn't wait any longer for you!
我等你等得不耐烦了！
When the news got round that a comedy show would be presented at our local cinema by the P.and U.Bird Seed Company,
当“皮尤”鸟食公司将在我们当地影院演出喜剧节目的消息传开后，