undamped wave无: not have; there is not; be w ...衰耗: pad control波: wave衰耗: pad control◇衰耗器 attenuator损耗波: evanescent wave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:无衰耗波，即可在微信中查询翻译
