Shuǐní de yìnghuà guòchéng jiàozuò shuǐhuà fǎnyìng.
The hardening of cement is called the hydration reaction.
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Technical/scientific. In chemistry: water molecules attaching to a substance (cement hydration, ion hydration). In sports nutrition: equivalent to English 'hydration'. Casual drinking-water talk uses 喝水 or 补水 ('replenish water').
