If we consider merely bodily labour as the cause of wealth,how can we then explain why modern nations are incomparably richer,more populous,more powerful,and prosperous than the nations of ancient times?

• 现代国家在财力、权力、人口以及其他各方面的进展比之古代国家不知要胜过多少倍，如果仅仅把体力劳动作为财富的起因，那么对于这一现象将怎样解释呢?