单词	pack unit
释义	pack unit 背包电台,步话机
随便看	relative saturation relative savings relatives by marriage relative scalar relative scale relative scale methodology relative scaler relative scarcity relative scatter relative scattering function relative scatter intensity relative score relative scotoma relative screw motion Relative sea level relative sea level change Relative sea-level rise relative search relative seasonal fluctuation relative sector relative sector search relative security relative sediment size relative sediment volume relative seed germination