环面可由矩形把其两对对边分别重叠起来而得到.A torus can be obtained from a rectangle by identifying opposite sides.所以就拓扑学而言, 球和环面是不同的东西.Topologically, then, a sphere and a torus are distinct entities.平面包络环面蜗轮副具有优良的啮合性能,它是一种具有广阔应用前景的传动形式.Worm ...
In analyzing the diaries, they found troubling age - related trends in sleep behavior.分析这些日志后, 研究人员发现睡眠行为中存在的年龄相关的问题.A spokesman insisted the two events were 'in no way related'...一位发言人坚称这两起事件“绝无关联”。A drug-rela...
He fell into disfavor as the president fell in the polls.总统大选失败后，他被打入了冷宫。Austrian voters went to the polls this weekend to elect a successor to the President.奥地利选民这周末去投票中心选举下届总统。Opinion polls indicated a two - thirds maj...
Everyone would have to work hard together to rebuild the economy.所有人都应该一起努力以重建经济。Two weeks later, surgeons carried out the operation to rebuild his face.两周后，外科医生实施了手术以复原他的面部。The company is making every effort to rebuild ...