double echo双重: double; dual; twofold; dupli ...回波: echo; return waves双重回代: double back substitution; double back-substitution多重回声,多次回波: multiple echo双重像回波: double image prism下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:双重回波,即可在微信中查询翻译