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 ...
Long or frequent depravity is a kind of morbidity!长期或经常的堕落就是一种病态!The result shows that incidence of myopia morbidity is 44.84 %.结果表明:近视眼的发病率为44.84%.Objective: The morbidity rate of asthenia cold syndrome in crowd was 9.目...
The notion that art should be controlled by intellectuals sickened him.他讨厌艺术应由知识分子所掌控的观点。The very notion of price competition is foreign to many schools.价格竞争这个概念对于许多学校都很陌生。Their relationship turned the standard notion of...