Fra
abbr. 联邦铁路局（Federal Railroad Administration）；联邦储备法（Federal Reserve Act）；流量警报记录器（Flow Alarm Recorder）；自由基型（Free Radical Type）
🗣️ 情景例句
Where are the toys hidden away?
那些玩具藏在什么地方？
It doesn't happen every day.
这可不是天天都有的。
The development of films with sound became a problem for Chaplin.
有声电影的研制对卓别林来说就成了问题。