我们落了座；我坐在一张低矮的长沙发上，他背朝着窗口和一个落地圆座钟。
We sat down, I upon a large, low divan, he with his back to the window and to a large circular clock.
结论：骨质疏松患者的脊柱畸形主要表现为脊柱的局部后凸尤其是胸段脊柱后凸角度的增大，其中又以凹圆背畸形最为多见。
Conclusion: the spinal deformities in osteoporotic patients are characterized by the local kyphosis of spine, especially thoracic kyphosis, and hollow round back is the most common deformity.
本文从新的几何关系出发，推导了牙轮背锥规径圆空间位置与钻头直径及其它设计参数的数学关系。
In this paper, a mathematic relationship between space position of gage surface and bit size, and other design parameters is derived on the basis of geometry of cone bit.
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