... Countif：某区域内满足条件的单元格的数目。【注；可理解为如果……怎么样】 Sum：求和 Sumif：满足条件的求和 Pmt：计算固定利率下的分期还款 ...
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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.
在满足设计要求和实际工况的条件下，通过混沌遗传算法和虚拟样机技术对该机构进行了优化设计，降低了成本，提高了生活垃圾装箱效率。
On the condition of design requirement and actual working condition, optimize the design of this mechanism by CGA and Virtual Prototype Technology, cut down the cost and improve loading efficiency.
理论分析和实际应用表明，在引出管满足径向补偿要求和支架做法满足要求的条件下，可以不设立管伸缩节。
Theoretical analyses and practice show that it is not need to set expansion joints when the out pipe meets the radial compensation requirement and the support meets the requirement.
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