gravel board的意思|示意

Built to withstand the attack of small armies such as swords and spears, these walls were made mostly by stamping earth and gravel between board frames.

为了抵御小型兵器的袭击，例如剑、矛，城墙大多由版筑(在夹板中填入泥土和碎石)而成。

According to the principium and test method of RayleighWave, contrast carrying-board in locale(natural gravel) , found the regress equation between two modulus of subgraded and draw a conclusion.

根据瑞利波测试方法与工作原理，对填料为天然砂砾的土基进行了现场测试并对比了传统的承载板法，建立两种方法所测土基模量之间的关系，提出了一些结论。