本文第一章为绪论，简要回顾几何设计与计算的研究概况。

In this paper, the first chapter is introduction, in which we briefly review some know-how of geometric design and calculation.

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采用基于约束驱动的几何推理和自由度计算方法，设计了约束检查策略与算法，解决了过约束与欠约束检查问题。

This paper introduces a method which uses geometry reasoning & degrees of freedom calculating based on constraint driven to solve the problem of checking over constraint & under constraint.

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计算得到成桥状态的几何线形控制点标高与设计标高相比，误差很小。

The error between the calculated values and the design ones of elevations at controlling points in the designated status is very small.

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