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 fixed gap ga-uge普通固定式间隙规
plain dividing apparatus普通分度装置
plaing and cypher switch明密码开关
plain low-carbon steel普通碳素钢
Plain-pouched Hornbill最小流量阀
plain section assumption平截面假定
plain spittoon with foot素色高脚痰盂
plain water extinguisher清水灭火器
plain interlining woolen素驼绒
Plain-throated Antwrenn.纯色喉蚁鹩