packern.包装者；包装机packer prototype封隔器虚拟样机packer deflection封隔器变形packer rs tumbler包装用玻璃杯packer rs glassware包装用玻璃器皿packer relief spring填装器松放弹簧packer-head machine打包机packer timing coupling压捆机同步离合器packer guarantee clause卖方保证条款packer-valve water-pressing assembly止水栓塞-阀式压水器