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