The strange egg finally hatches.

这颗奇怪的蛋终于孵化了。

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When a strange egg appears in their nest, Mr. And Mrs. Bird kindly take it upon themselves to raise the "baby bird" inside.

鸟先生和鸟太太在它们的窝里发现了一个奇怪的蛋，好心的夫妇俩将这个蛋当作自己的孩子来抚养。

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I put the egg in the orange dye bottle first, after I looked around, a strange thing happened, my egg was gone!

我先把蛋放进橙色的染料里，在我环顾了四周一下之后，忽然发现蛋失踪了。

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This scenario has raised the strange prospect of at least possibly six parents: genetic donors, the donor of the egg, the donor of the womb and, indeed the people who brought the child up.

BBC: NEWS | Programmes | If | The future's bright, if you're female...