进而研究了当t是等距同构时，集函数表示m的一些性质。
Moreover, some properties of the representation m when t is an isometric isomorphism are discussed.
指出即使具有自由曲线造形功能的体素造形系统，也无法精确表示等距运算。
It is also unequivocally pointed out that the isometric operation cannot be precisely represented even if in a body surface modelling system which has the function of free curve modelling.
地理网络的中心服务范围在实际生活中应用广泛，传统方法一般用等时区或等距区表示。
A center's service area of a geographic network is broadly applied in practical life. In traditional method, it is expressed by an isochronous area or an equidistance area.
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