The various aspect problems in city construction are more and more complex with cities' scale and up-to-dateness continuously growing.

随着城市规模的不断扩大和城市更新水平的不断提高，城市建设中的各个方面问题越来越复杂。

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To combat this, we need to a few more pieces to the puzzle, the first of which is the up-to-dateness vector (UTD vector, or just UTDV).

为防止此种情况，我们需要再多用几个矢量来解决难题，第一个是最新矢量（UTD 矢量或 UTDV）。

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