Fac
abbr. 空军前进引导员（forward air controller）；联邦咨询委员会（Federal Advisory Council）；联邦航空委员会（Federal Aviation Commission）
🗣️ 情景例句
Hi, Michelle.
嗨， Michelle。
Necessity is the mother of invention.
穷则变，变则通。
We'll wait and see what they say.
看看他们怎么说吧。