大家在查：砂状氧化铝高纯氧化铝气相法二氧化硅单内核内核空间固结磨具棕刚玉拜耳法四羟基合铝酸钠工业氧化铝

古砖

n.antique brick

古砖

古砖

1

Mao Zedong , followed by Zhu De, passed the old tile steps on the west side of the rostrum and stepped on Tian'anmen Rostrum first .

毛泽东在朱德的陪伴下，沿着城楼西侧的古砖梯道，最先登上了天安门城楼。

2

Great Wall Guzhuan stop foreign gun shrapnel .

长城的古砖挡不住洋炮的弹片。

3

Research on the test and analysis of ancient brick tower dynamic characteristics

古砖塔动力特性测试与分析研究

4

Application of digital surveying and mapping to the survey of Yuanyingsi ancient block tower

数字化测绘技术在源影寺古砖塔测绘中的应用

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