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.
还有评论家将矛头指向近来美国学校的教育，认为学校过分强调培养学生的自尊———而这是以牺牲自我约束力为代价的。
Others point to the recent emphasis in US schools on cultivating student self-esteem -- at the expense of self-restraint.
在列车上过分用脑受到约束。
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