“叽叽喳喳”、“呱呱呱”…动物们在唱春天的赞歌。燕子飞来飞去，衔泥作巢。

"Chirp", "quack quack"... the animals are singing hymns of spring. the swallows fly, take mud nest.

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由于鸟在筑巢过程中取得了更多的经验，经常只会掉下很少的草，表明它们正在不断地改善作巢技巧。

As the birds gain more experience building nests, they drop grass less often, suggesting that they improve at their art.

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定义巢状型别，指定其名称、属性、其扩充的型别和其实作的介面。

Defines a nested type, given its name, attributes, the type that it extends, and the interfaces that it implements.

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