1、它是源自cheap(便宜)表示更便宜并用以比较如:如果是cheap的话--- That white shirt is very cheap. 意思是说那件白色的衬衫很便宜 如果是cheaper的话--- This red shirt is cheaper than that white shirt. 意思是说这件红衬衫比那件白衬衫便宜。
