压进板内的都是圆型，无内牙。
事实是，即使很近的距离内，长弓依然无法穿透板甲。
The truth is even at close range a longbow wont pierce plate armour.
板壳内的应力应变场沿厚度方向变化。
The stress and strain in the board changes in the direction of thickness.
将支架固定在前围内板左侧的对应孔中。
Fix bracket in the corresponding hole on the left side of front wall inner plate.
岩体形成于板内引张的应力松弛环境。
Rock body formed in plate extensional background and a loose stress state.
岩体形成于板内引张的应力松弛环境。
Rock body formed in plate extensional background and a loose stress state.
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