Cnas
abbr. Chief of Naval Air Services 海军航空服务主管; Civil Navigation Aids System 国内航海援助系统
🗣️ 情景例句
Are you Mr. Chen?
你是陈先生吗？
To know everything is to know nothing.
事事皆知，事事不懂。
I guessed, extremely old.
我猜测是极古老的东西。