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-and-fertilizer drill通用谷物肥料条播机plain external grinding machine普通外圆磨床plain thrust shoes type bearing平面推力瓦块式轴承plain seasonally freezing river平原季节性冰冻通航河流plain-clothes police officers便衣警察plain circular knitting machine单面圆型针织机plain grinding machining system普通磨床plain grinding machine internal普通内圆磨床plain life and arduous struggle艰苦奋斗plain hematocrit capillary tube扁平红细胞压积毛细管