Few people, when it comes down to it, are so selfless.说到底，很少有人能这样无私。He is selfless as a teacher.作为一名教师, 他是无私的。She was a wonderful companion and her generosity to me was entirely selfless...她是一个极好的伴侣，她对我慷慨大方，一心只为我着想。A sel...
?澍宸廴狈?蛋彼幔0蛋氨酸和亮氨酸.Cottonseed meal is deficient in lysine, methionine and leucine.植树细胞中丙氨酸和亮氨酸 、 缬氨酸的主要前体是丙酮酸.In plant cells the principal precursor of alanine , as well as leucine and valine, is pyruvate.饰胶蛋白聚糖(Decorin,D...
The planet is probably in orbit around a small star.这颗行星可能正环绕着一颗小恒星运行。Yet bigger satellites will be sent up into orbit.更为大型的卫星将被送入轨道。The orbit of this comet intersects the orbit of the Earth.这颗彗星的轨道与地球的轨道交叉。...