1. 作圆之人：roundelay 圆舞 | rounder 作圆之人 | Roundhead 圆颅党

2. 搓圆机：rounded hammer 圆头锤 | rounder 搓圆机 | rounding bending machine 扒圆机

3. 滚圆机：revolving oven 转炉 | rounder 滚圆机 | sheeter 压片机

4. 成圆机：round pin 圆形针 | rounder 成圆机 | rove 粗纱

noun

1. a tool for rounding corners or edges

2. a dissolute person
usually a man who is morally unrestrained

Synonym: libertinedebauchee