税目约束比例可这样理解：关贸总协定的若干缔约方经谈判达成关税减让协议，对约束的商品项目进行谈判，规定已约束的商品科目的减让比例。
而且收入越低，信贷约束越紧的人，其花去的退税款比例越高。
Poorer, more credit-constrained people spent a higher share of their rebates.
在我国目前情况下，过低的持股比例可能还不足以形成有效的激励与约束机制，管理人员仍会倾向于采取不相关或者相关程度较低的多元化战略。
Too low proportion of holding stock now in china cannot form effective incentive and restricting mechanisms. The managers will still take low related or unrelated diversification.
采用比例满应力法及序列线性规划方法分别处理强度约束和刚度约束。
The strength constraints and stiffness constraints are treated by proportional full stressed method and sequential linear programming method respectively.
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