mboq biangz mboq cix形容adj忘恩负义ungrateful习语Idiom ofA-B-A-C 重复之A-B-A-C Reduplication Pattern Phrase ofmboq1biangzʔbo¹¹ pʲeŋ³³ ʔbo¹¹ ɕi⁵³广南县者兔乡Zhetu District, Guangnan County