roman cement 中文意思是什麼
roman cement
解釋
羅馬水泥-
The romans discovered that a mixture of quicklime, volcanic ash and aggregate would harden under water - the roman cement or hydraulic lime was born
生石灰,火山巖灰燼和其它混合物在水的作用下會變硬的特性由此羅馬水泥或水化石灰就誕生了。
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