zhè / lǐ / de / yìng / shuǐ / hán / yǒu / jiào / duō / gài / hé / měi / shāo / kāi / hòu / róng / yì / liú / xià / shuǐ / gòu

这里的硬水含有较多钙和镁，烧开后容易留下水垢。

The hard water here contains a lot of calcium and magnesium, so it easily leaves limescale after boiling.