Evolution can explain why human embryos look like gilled fishes.进化论能够解释为什么人类的胚胎看起来象除去了内脏的鱼一样.A sharp demarcation of adventive embryos from zygotic embryos cannot be drawn.不定胚与合子胚之间不能划分出明显的界限.Most grass embryos have a fla...
Evolution can explain why human embryos look like gilled fishes.进化论能够解释为什么人类的胚胎看起来象除去了内脏的鱼一样.Early division phase embryos may use metabolites provided by the suspensor, persistent and degenerating synergids.早期分裂时期的胚可以利用胚...
他抖动马缰.He sawed at the reins.手持马缰,拇指在上,小指在下.Hold the reins in your hands with your thumbs on top and pinkies on the bottom.军官勒住马缰, 向老人问路.Pulling his horse in, the officer inquired the way of the old man....