单词	element， parent
释义	element， parent母元素核能名詞
随便看	problem behavior graph problem board problem box problem-centered coping problem-centered learning problem child problem classification problem confirmation status problem data problem date of onset problem definition problem dependent description problem description problem descriptor system problem descriptor system--pds problem descriptor system，pds problem determination problem determination aid problem determination procedure problem determination，pd problem diagnosis problem dissolving problem drinking problem established date/time problem file