词汇	railway pass
释义	railway pass 免费证
随便看	double-layered soil double-layered subgrade double layered text editor double-layered tube double layer effect double-layer ejecta double layer electric effect capacitor double-layer electrification double layer electrode double-layer-electrode double layer embedment double layer epidermis double layer e-type membrane double layer exhaust pipe double layer fabric double-layer fabric Double-layer Fabric doublelayer fiber double layer fiber doublelayer fibre double layer fibre double-layer film double layer filter double-layer floor double layer fluorescent antibody technic