后缀变名词(1)-ence，-ance结尾名词：存在exist-existence发生occur-occurrence查阅/参考refer-reference更喜欢/偏好prefer-preference不同differ-difference接受accept-acceptance出现/外表appear-appearance履行perform-performance抵制resist-resistance指导guide-guidance进入enter-entrance保险insure-insurance帮助assist-assistance忍受endure-endurance/tolerate-tolerance(2)-tion，-sion结尾的名词：生产produce-production介绍introduce-introduction消费consume-consumption减少reduce-reduction认为/假设assume-assumption/suppose-supposition
