national warning system全国: nationwide; countrywide; the ...警报系统: warning system光警报系统: optical alarm system警报系统: alarm system; alert system; warning systems预警报系统: early warning system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:全国警报系统,即可在微信中查询翻译