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 ...
I don't know that it's made the decision any easier.我不认为这对作出决定有丝毫帮助。Slip-on shoes are easier to put on than lace-ups.一脚蹬比系带鞋容易穿。To a certain extent it's easier for men to get work.在一定程度上，男性更容易找到工作。...
I gagged on the stench of stale urine.尿臊味让我想吐。Calcium is excreted in the urine and stools.钙通过尿液和粪便排出体外。Urine is sterile.尿液是无菌的。A hydrometer for measuring the specific gravity of urine.测量比重或密度的仪器.Although the dark urine m...
He felt it was a threat to his masculinity.他觉得这对他的男子气概是一种威胁。Football is a bastion of masculinity in this area.在该地区足球是男子汉的天地.The old ideas of masculinity do not work for most men.对于大多数男人来说，关于男子气概的老套观点现在已不再适用了。...