同义词
1)back in bracket,后内括弧形2)back out bracket,后内括弧形3)Posteromedial corner,后内侧角4)backward interpolation,向后内插5)back in,后内刃6)back in circle,后内圆形7)back in spiral,后内环绕，后内螺旋形8)Postmedial approach,后内侧入路9)interanl clearance after mounting,安装后内隙10)ventral posteromedial nucleus,腹后内侧核
