wedge-shaped stone building block used in constructing an arch or vault
例句与用法
1.
The presented insulating lift adopts the traditional scissor structure , and is actuated by the master - slave voussoir and horizontal slide block with relay style 该绝缘升降平台采用传统的剪叉式结构，以及绝缘主从楔块驱动和水平驱动相互接力交替作用的驱动方式。
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