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 concrete footing无筋混凝土地基
Plain Olive Honeyeater
plain rib body machine平罗纹大身圆型针织机
plain grinding machine普通磨床
plain language message明语电报
plain compression ring普通压缩环
plain fashioning point收针刺
plain line articulator平面牙合架
plain filigree article平填丝制品
plain-woven C/SiC平纹编织C/SiC