Now, one way of representing the evolution of languages, showing the way languages are related to each other, is with the family tree model.
现在，描述语言的演化、展示语言之间的相互关系的一种方法，是用系谱图模型。
The tree model is a convenient way of representing the development of a language family and of showing how closely related two of more languages are.
树形模型是表示一个语言家族的发展并显示两种或更多语言的密切相关程度的一种便捷方式。
To ensure the quality of structure design and efficient configuration of mechanical products, a part family architecture model based on hierarchy tree constraints was proposed.
为保证复杂机械产品具有良好的设计结构和高效的配置求解，提出了一种基于树状约束的零部件族结构模型。
To ensure the quality of structure design and efficient configuration of mechanical products, a part family architecture model based on hierarchy tree constraints was proposed.
为保证复杂机械产品具有良好的设计结构和高效的配置求解，提出了一种基于树状约束的零部件族结构模型。
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