有水平拱背和水平的内弧面的互相支撑的拱石的拱。
An arch with mutually supporting voussoirs that has a straight horizontal extrados and intrados.
也就是说，轻微拱背并打开胸廓，而不是单纯移动手臂。
This means that it slightly arches the back and opens the chest, rather than moving the arm.
有一只丹顶鹤展翅拱背，摆出威吓的姿态以纾解拥挤的压力。
One flares its wings and arches its back in a dramatic threat display to relieve the tension of crowding.
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