然后，你就回头找下一个杠杆点，或制约因素。
And then you can go back and find the next leverage point, or constraint.
从历史上看，缺氮，不缺土地或不缺水，一直是农业最大的制约因素。
Historically, lack of nitrogen, not lack of land or water, has been its biggest constraint.
其中包括项目与产品要求、准则、假设、制约因素和与项目有关的其他影响，以及如何在项目中管理或处理上述的每一个方面。
This includes the project and product requirements，criteria，assumptions，constraints，and other influences related to a project，and how each will be managed or addressed within the project.
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