Instruments, apparatus and models, designed for demonstrational purposes (for example, in education or exhibitions), unsuitable for other USES.

专供示范(例如，教学或展览)而无其他用途的仪器、装置及模型。

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For a long time, the study of the family legal education of our country is weak, which is short of systematically demonstrational research, whose research visual Angle is unitary.

长期以来，我国的家庭法制教育研究薄弱，缺乏系统的实证研究，研究视角单一。

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And with the demonstrational geographic elements of road and forest, the road design is realized and the constructional method of virtual forest environment is mentioned based on TIN.

并以道路和森林为示范地理要素，初步实现了基于TIN的道路设计，并提出了基于TIN的虚拟森林环境的构建方法。

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