critical echo delay临界: critical; crisis; criticalit ...回声: echo; bounce back; reverbera ...延迟: delay; lag; defer; postpone; ...临界回声级: critical echo level回声延迟时间: time of echo delay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:临界回声延迟，即可在微信中查询翻译
