predecessor的词根是cess。predecessor的意思是前任，原先的东西，被替代的事物。predecessor的例句He is cast in a different mould from his predecessor（他和他的前任性格不一样）。
predecessor的例句He took over from his predecessor last may（去年5月他接替了他的前任）；A step cannot be a predecessor of itself（步骤不能是自己本身的先行符）。
