对偶间隙

quality paper───高级报纸；严肃报纸

equality law───平等法

quality papers───高级报纸；严肃报纸

duality───n.二元性；[物]二象性

wealth gap───贫富差距

quality sleep───优质睡眠

credibility gap───信用差距；言行不一致（指官员言论与事实的不符）

quality food───优质食品

quality time───品质时间，黄金时光（父亲、母亲或双亲保留来专门讨论与家庭和小孩有关之事务的时间）

But because of the influence forming pattern of duality in the city and the countryside, the gap between the city and the countryside 'social development is very large.───但是由于长期形成的城乡二元结构格局的影响，城乡经济社会发展差距仍比较大。

The conditions under which there is no duality gap between the semi-infinite quadratic programming and its dual programming are given.───给出了半无限二次规划和它的对偶规划之间没有间隙的条件。