动词 roughen:

1. make rough or rougher

roughingn.粗加工；草拟动词rough的现在分词形式.roughadj.粗糙的；粗略的，大概的；粗暴的；艰难的；讨厌的；不适的；汹涌的adv.粗糙地；粗暴地n.粗制品；暴徒；高低不平的路面vt.使粗糙；殴打；草拟Roughage is good for health.常吃粗粮有好处。rough dependency order theorem粗依赖的序定理roughing cattle through winter用粗料喂牛越冬Rough cut resource planning LT粗资源计划rough surface grinding machine表面粗磨机roughness detection equipments平整度检测设备Rough Cut Capacity Planning LT粗能力计划roughing special slotting tool特种粗插刀rough/ middle rolling mills粗中轧机roughness measuring instrument粗糙度检测装置

1. Before painting the wood, roughen the surface with sandpaper.
   油漆木器前，先用砂低把表面磨毛糙。
2. Roughen the surface before applying the paint.
   先把表面弄毛糙再涂颜料。