v.重复，随声附和( echo的过去式和过去分词 )；类似；发射（声音等）；发出回声 双语释义：n.(名词)[C]回声; 共鸣 a sound sent back or repeated from a surfacev.(动词)vt. & vi. 回响 sound again; repeat in soundvt. 重复; 随声附和 say or do always what another says or does英英释义： echon.the persistence of a sound after