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...
The house has an informal atmosphere.房间里有一种轻松随意的氛围。Making the house habitable was a major undertaking.把这所房子收拾得可以住人，那可是项大工程。The house was so handsome, with a lovely countrified garden.这座房子很漂亮，带一个田园风情的美丽花园。The crowd in Rob...