people line lineart labor putting axle chasis employee workforce manufacturing workers fctory Manufacturing Line Workers clip art 制造 线 工人 制造线工人剪贴画
factory lineart machine industry labor worker rotary milling employee industrial manufacturing Rotary Milling Machine clip art 扶轮社 铣削 机 铣削雇员工业制造厂艺术线条机行业劳动工人扶轮社