In the requirement analysis stage, the users 'requirements were captured by use cases, and the system functions were described.
在需求分析阶段，以用例来捕获用户需求，描述系统功能。
Afterwards the software development introduced the life cycle concept; requirement analysis goes into its first stage.
后来软件开发引入了生命周期的概念，需求分析成为其第一阶段。
Not only the requirement of the computing speed is met but also the slope analysis of the construction stage is achieved.
这一方法不但很好地满足了计算速度的要求，而且也实现了考虑施工阶段边坡分析的目标。
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