1·An approximate anatomy of the fertile egg is shown in the accompanying notes.
附带注解中显示了受精卵的大致构造图。
2·He kindly offers them an extra egg laid by a fertile couple, and the male penguins take turns keeping it warm.
他好心地从别的企鹅那里找来一颗蛋，这两只雄性企鹅便轮流给它保暖。