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 ...
他的喉头哽住了, 只是用手轻抚着玛丽的头发.His throat was full to choking. He gently stroked her hair.索菲娅喉咙哽住了，说不出话来。Sofia's throat had tightened and she couldn't speak.他想说什么, 但哽住了, 什么话都说不出来.He tried to say something, but gulped, a...
为什么她再三地做那个实验?Why did she do that experiment once and again?我们再三地讨论, 最后达成协议.We discussed it again and again, and then we saw the light.我再三地请求上帝给予指引.And I repeatedly asked God for direction....
A Couple of drumsticks and one coleslaw, please.请给我两双鸡腿,一份生菜沙拉.There's tuna fish for sandwiches and you'll find coleslaw in the fridge.有鲔鱼叁明治给你冰箱里还有凉拌卷心菜.All right. I'll have the fried chicken and coleslaw...