柯林斯詞典longitudinal wave 1. N a wave that is propagated in the same direction as the displacement of the transmitting medium 縱波→compare transverse wave 返回 longitudinal wave劍橋詞典a wave moving in the same direction of travel as the vibrations (= fast movements backwards and forwards ) of the particles of the substance through which it is travelling 縱波（物理學中振動方曏與傳播方曏在同一方曏上的波） 比較transverse wave 返回 longitudinal wave