“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.
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.
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.
但干细胞促归巢的选择却非常棘手，本文将对干细胞促归巢的研究作一综述。
The selection of the promotion technology is a formidable difficulty. We will examine the advances on the promotion of stem cell homing in the review.
但干细胞促归巢的选择却非常棘手，本文将对干细胞促归巢的研究作一综述。
The selection of the promotion technology is a formidable difficulty. We will examine the advances on the promotion of stem cell homing in the review.
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