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.Two fdmilies Of characteristic lines in the hyperbolic region are not orthogonal.在双曲型区域两族特征线互不正交.F...
就剩下我用指尖扒着悬空在几百英尺高的地方。I was left hanging by my finger-tips over a drop of hundreds of feet.他正一动不动地站在这悬空巨石的顶端,凝着神,敛着翅.He stands firmly at the top of a gigantic rock gazing afar.他的身体悬空片刻.For a moment he hung free....
此酒芬芳馥郁,香料与黑莓及桑葚等水果的香气混合交织.On the nose spices play with fruits such as blackberry and mulberry.我喜欢吃紫色的桑葚.I like to eat purple mulberries.桑葚通过酒精发酵、醋酸发酵制成非常有益于健康、市场前景广阔的新型饮料——桑葚保健果醋.Glucose of the jujube could be converted ...