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 text messages typing普通文本信息打字
plain thread broaching tap普通螺纹拉削丝锥
plain and simple reasoning浅近的道理
plain lead-covered cable光皮铅包电缆
Plain tidal river net work感潮河网
plain bearing pillow bolck普通轴承轴台
plainclothes investigation便衣稽查