Plainard普莱纳尔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 glass is transparent.普通的白玻璃是透明的。Plain washers for clevis pins销钉专用垫片plain cooking pot with handle素色带柄烧锅plain-clothes investigation[法] 便衣稽查plain radial drilling machine普通摇臂钻床plain equal side outlet elbow不带边周径三向弯头Plain speaking with no hiding直言不隐Plain-tailed Warbling Finchn.平尾歌鹀plain untucked shirt front.清楚地拆开衬衫的前襟。plain-straight-face flange平面法兰