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
It has been a learning experience. That's true.
这真是一次学习经验， 真的。
I'm a new employee.I was hired yesterday.
我是昨天被雇用的新雇员。
He had had a long and uncomfortable trip, for he had been confined to the wooden box for over eighteen hours.
他经历了一次漫长而又难受的旅程，因为他在那木箱里闷了18个多小时。