This roast hen is done to a turn.

这鸡烤得正到火候。

《新英汉大辞典》

The underlying principle is known as the disposable soma. This is the idea that a hen is merely an egg's way of making another egg.

最基本的原理是可支配体细胞，它就像是一只从鸡蛋中孵出的母鸡再下另外的蛋一样。

youdao

This is chick, And that is a hen.

这是一只小鸡，那是一只母鸡。

youdao

This is the idea that a hen is merely an egg's way of making another egg.

ECONOMIST: Ageing