custom中等

(47) The United States is the product of two principal forces — the immigration of European peoples with their varied ideas, customs, and national characteristics and the impact of a new country which modified these traits.

(47) 美国是两种主要力量的产物——一是带着各种各样思想、习俗和民族特征的欧洲移民，二是改变了这些特性的新国家所产生的影响。

Just as the bewildering variety of human courtship rituals might all be considered forms of sexual selection, perhaps the world's languages, music, social and religious customs and even history are governed by universal features.

正如人类求偶仪式虽然多得令人眼花缭乱，却都可以被视为性选择的形式一样，或许世界上的语言、音乐、社会和宗教习俗乃至历史都受普遍特征的支配。