snowcatn.雪地履带式车辆snown.雪；积雪；下雪vi.下雪vt.使变白；雪覆盖snow-thawing agent融雪剂snow protection hedge防雪篱snow-making machine造雪机器snow- melting agent融雪剂snow shovel reflector雪铲形反射器snow cleaning vehicle除雪车snow water equivalent雪水当量snow disaster railway铁路雪害snow-moving machine清雪车Snowden's stethoscope