单词	筒式记录器
释义	筒式记录器drum recorder
随便看	principal valence principal valence-- principal valency--main valency principal valency principal value principal vanishing point principal vector principal vein principal velocity principal vent principal vertical circle principal vertical plane principal vertical plane of photograph principal vibration principal view principal voice principal volcano principal voltage principal [voltage current] characteristic principal wave principal--wave principal wave directoin principal wave--major wave principal weight principal wife principal word