plainern.抱怨者=complainer.
plainadj.清楚的;简单的;坦白的;平常的;朴素的;纯的n.平原;广阔的区域adv.完全地;纯粹地
plain linoleum单色油毡
plain nonsense明显的废话
plain cheating彻头彻尾的欺骗
plain specimen无切口试样
plain forestry平原林业
plain water.纯净水
plain kerchief素色头巾
plain indexing普通分度
plain tomogram体层平片
Plain Parakeetn.纯色鹦哥