"Actually, this is a bit similar to water freezing, when the temperature is high, water is water, once the temperature drops, the water will become extremely hard ice, this cement is normally powdery, but once mixed with water, it will turn into stone, and it can remain strong for a hundred years, and it is the best material to make houses and build city walls with this."

Sun Ming hurriedly spoke.

......

"Saving the Ming Empire from the Son-in-law" Chapter 176 This is cement? I am hitting it in my hand, please wait a moment,

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