他们不再是一些小群体，而是居住在一个大型的社会中，有更加复杂精细的社会组织，可能是以拥有共同的祖先的氏族来划分群体。
They were no longer a series of small bands but lived in a large community with more elaborate social organization, probably grouped into clans of people of common descent.
这种复杂精细的机器须由技能熟练的人操作。
基本的折纸艺术所使用的纸张数很少，但是却可以通过组合造出各种复杂精细的设计。
The number of basic origami folds is small, but they can be combined in a variety of ways to make intricate designs.
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