1)pain principle,唯苦原则2)principle of happiness,唯乐原则3)realityprinciple,唯实原则4)pleasurepain principle,苦乐原则5)Only-ciphertext principle,唯密文原则6)One nationality for one person,国籍唯一原则
用法例句
The paper has analyzed the reason and behavior of university students,and pointed out that university students can get richer nutrition from reading,by only following the principle of happiness.
