The authors show that the hyperboloid of one sheet and the hyperbolic paraboloid are ruled surfaces.作者证实:单叶双曲面和双曲抛物面是直线曲面.The mathematical model of the hyperboloid twist drill was introduced.介绍了以旋转单叶双曲面作麻花钻钻尖后刀面的数学模型.The...
他熬费苦心地描绘了这次野餐的根由.Laboriously did he describe the genesis of the picnic.大概这就是我和沙子结下不解之缘的根由.That's probably why I have an affinity with sand.这样,他力气的根由人还是不知道.So his strength was not known....
“ 她用薄纸包着放在她的梳妆台上. ”'she had it wrapped in tissue paper on her bureau. "版画裹在一张薄纸里.The engraving was rolling up in a sheet of tissue paper.他拿了一大束用白色薄纸包着的花.He carried a big bunch of flowers done up in white tissue....