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

沙虎的会不同时间段母亲的输管里发育和孵化。

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

它未受精的细胞添加到一团黄并挤一个称为输管的弹性管。

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

沙虎不同时间其母亲的输管内发育和孵化。

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.

当幼体用光了自己中的黄，它们就会吃掉其它和幼体直到每个输管里只剩下一个小鱼。

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，有两条功能性输管，某些情况下，现代鸟类也可以一次产下两个蛋。