哲学趣谈四则■陈致平请求鸭嘴兽原谅吧哺乳动物，一般的都是胎生。而鸭嘴兽会生蛋，是卵生，但却属于哺乳动物。这都已成为生物学的常识了。然而，恩格斯却毫不隐瞒自己在这类常识问题上犯过的错误。恩格斯在１８９５年给康·施米特写了一封信，信中说到自己曾经错误地认... Four interesting philosophical talks: ■ Ching-Ping Chen asked the platypus to forgive her mammals. The platypus is an egg, but it is a mammal. This has become a common knowledge of biology. However, Engels did not hide his mistakes made on such common sense issues. Engels wrote a letter to Cornish in 1895. He said that he once wrongly recognized...