需求描述了所有产品功能，并且定义了实现这些功能的约束条件。
The requirements describe all the product functions, as well as the constraints under which these functions should be realized.
通过分析系统必须满足的需求和约束条件，我们可以很方便地开发一些模型去呈现系统。
We facilitate the development of models that represent systems based on the analysis of requirements and constraints that the system must fulfill.
看空者认为，在黄金市场需求原因和供应约束条件没有发生重大变化的情况下金价仍然如此之高完全违背逻辑。
It defies logic, say the bears, that its price should remain so high without any fundamental change in the sources of demand or constraints on supply.
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