追溯到四千年前的原始社会，恶劣的生活条件迫使古人使用石块和木器作为武器来打猎和自卫。
Far back in primitive society about four thousand years ago, hard living conditions compelled the ancient people to use stone and wooden tools as weapons for hunting and self-defence.
若有机会，我会返古，回到原始社会，过着群居生活，享受绿色食品和无污染环境所带来的乐趣。
If I have a chance, I prefer to go back to the primitive society and live a community life and enjoy the green food and unpolluted environment.
假如没有了学习，人类将永远生活在愚昧和黑暗的原始社会中。
If there is no learning, humans will live in the darkness forever and stay in the primitive society.
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