1.Most hens begin to lay egg in spring.
多数母鸡从春季开始下蛋。
2.But some significant differents such as the lay egg mode and the development of egg membrane appendix present, too. 2.
但它们产卵方式明显不同，胚胎发育过程中胚膜表面附属物等有很大差异。
3.lay egg, fly away after laying egg
下蛋，下蛋后本体飞的高