LSAT1-4 22. It is illogical to infer a second and different effect from a cause which is known only by one particular effect. This is incorrect because the inferred effect must necessarily be produced by some different characteristic of the cause than is the observed effect, which already serves entirely to describe the cause. 惭愧惭愧,我还是没有看出来这段话究竟有什么逻辑上的错误,谁能指点我一下呢?