The third layer has a very thin, dense structure that increases water resistance.
第三层是层非常薄、紧密的结构以增强防水。
The reaction layer has dense structure and can be closely together with the slag.
反应层结构严密与渣紧密结合在一起；
The reaction layer has dense structure and can be closely together with the slag.
反应层结构严密与渣紧密结合在一起；
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