这对快速识别工作区或者流中构件状态的不同累计来说，是十分有用的。
This is useful for quickly identifying different cumulative states of a component in a workspace or stream.
而自2000年以后则呈现出快速增长的特点，已累计报告1704例。
And since 2000 it shows the characteristics of rapid growth, the report has a total of 1704 cases.
由于全站仪和计算机的普及和推广，尤其是GPS定位仪的开发，直接由导线点或其它控制点测设曲线中心线，既快速便捷又减少了累计误差。
Because popularizing and spreading of computer, especially exploiting of GPS, it is convenient and lessening Errors that surveying curve center point from control point.
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