可能存在内部或外部的约束条件，真是的或设想的。
There may be internal or external constraints, real or imagined.
科尔奈效应指出，企业预算约束条件不同其要素需求弹性亦不相同，软预算约束的存在会导致企业的要素需求弹性降低，要素需求量增加。
Kornai Effect shows, input demand elasticity is different between enterprises with different budget constraints and soft budget constraint causes an increase in input demand.
根据该模块的几何特点，分析了模块的对接过程和相邻两模块对接的几何约束关系，给出了当存在几何及控制不确定性时，完成对接最基本的几何约束条件。
The docking process of the module was analyzed. When the uncertainty about control and geometry occurs, the basic geometric condition is analyzed to finish the docking action.
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