Plain of厄斯垂伊伦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 cast-iron share普通铸铁犁铧plain-milling machine平面铣床,普通铣床plain carbon tool steel碳素工具钢plain-barrel led roll平辊Plain-colored Tanagern.纯色唐加拉雀Plain and Cypher Switch明密开关plain projection method压平法Plain-bellied Emeraldn.纯腹蜂鸟plain cement sand syrup素水泥砂浆plain clothes detective便衣警探