angle of skew back 侧倾角 ; 后倾角 ; 拱背角
skew back stone 起拱石
skew-back 拱脚斜块
skew-back saw 拱背锯
skew-back profile 侧斜叶廓
skew back hand saw 弯背手锯
skew back hand dust 弯背手锯
back wall skew back 后墙拱座
N the sloping surface on both sides of a segmental arch that takes the thrust 拱座
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