一切迄今为止社会的历史都是阶级斗争的历史。
循环经济原则不是可选的,它们对生存至关重要。
Technology can be a powerful tool for development if applied correctly.
【释义】:积累千万财富,不如掌握一门技艺。  
If you don't know where you are going, any road will get you there.
I think the target of anything in life is to be happy.