a fertile egg 成熟的蛋
nonsurgical collection of fertile egg 非手术采卵
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oosperm , fertilized ovum
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。
youdao
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。
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