yellow discolouration　是什么意思_yellow discolouration　用英语怎么说_yellow discolouration　的翻译_yellow discolouration　翻译成_yellow discolouration　的中文意思_yellow discolouration　怎么读,yellow discolouration　的读音,yellow discolouration　的用法,yellow discolouration　的例句