preferential

优待

treating one person or group better than others, often unfairly

得到比他人更好的对待，常指不公平的方式。

优惠利率

a lower interest rate or price offered to special customers or groups

提供给特定客户或群体的较低利率或价格

优惠关税

a lower tax on imported goods, often granted to specific countries

给予特定国家的较低关税税率。