1)negative valence,负原子价2)negative primaries,负原离子3)negative artwork,负原图4)reasons of being bullied,受欺负原因5)fair tax payment principle,公平税负原则6)principal of bearing responsibility solely for one's own crime,罪责自负原则7)"Caveat Emptor" (let the buyer beware),「买者自负」原则8)"let the buyer beware" principle,「买者自负」原则
