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-clothes officers便衣人员
plain river network area平原河网区
plain-and ball bearing滑动与滚动组合轴承
Plain-breasted Piculetn.纯胸姬啄木鸟
plain-line articulator铰链咬合架, 平线咬合架
plain-wire-cut brick直切砖
plain lead covered cable裸铅包电缆
Plain-capped Brilliantn.纯顶星喉蜂鸟
Plain Language Addresser语言朴素的讲话者
plain-clothes policeman便衣警察