The first can subsist independently of the second, but the second can occur only because of the existence of the first: From the point of view of semantics, errors must be accidents: if in the extension of "horse" there are no cows, then it cannot be required for the meaning of "horse" that cows be called horses.
第一个可以独立于第二个而存续，但是第二个只因为第一个的存在才出现： “从语义学的观点看，错误一定是意外：如果在“马”的外延中没有牛，那么对于“马”的意义来说，就不能要求牛被称为马。