1.本课课程内容是what are their jobs?他们的工作是什么?
2.名词从单数变为复数是engineer-engineers,milkman-milkmen,postman-postmen,policewoman-policewomen,housewife-housewives。
3.operator是操作员,经营者,专业公司的意思。computer operator是计算机操作员,a tour operator是经营旅游业者,a bus operator是公共汽车公司。er指地位低的人,or指地位高的人。