Sand tiger shark eggs develop and hatch inside their mother's oviducts at different times.

沙虎鲨的卵会不同时段母亲的输卵管里发育和孵。

It starts with an unfertilized egg cell, added to a blob of yolk, and squeezed down a stretchy tube called an oviduct.

它始于将未受精的卵细胞添加到一团卵黄并挤一个称为输卵管的弹性管。

Sand tiger shark eggs develop and hatch inside their mother’s oviducts at different times.

沙虎鲨卵不同时母亲的输卵管内发育和孵。

When the hatchlings run out of yolk from their own eggs, they eat the other eggs and hatchlings until one baby shark from each oviduct remains.

当幼体用光了自己卵中的卵黄，它们就会吃掉它卵和幼体直到每个输卵管里只剩下一个小鲨鱼。

And we know that in modern birds, there are two functional oviducts and that modern birds can also lay two eggs at a time under some circumstances.

我们知道，现代鸟类中，有两条功能性输卵管，某些情况下，现代鸟类也可以一次产下两个蛋。