plain to对 ... 是清楚的
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 surface machine光滑面电机
plain total enclosure普通全封闭式机壳
plain double warp bag双经平纹袋
Plain-breasted Hawkn.姬滨鹬
plain journal bearing普通颈轴承
plain woven composite平面编织复合材料
plain finish concrete清水混凝土
Plain-backed Thrushn.光背地鸫
plain deep wash basin素色深脸盆
plain concrete column无筋混凝土柱