Efs
(ef 的复数) abbr. 每面（each face）；超精度（extremely fine）；仰角指示器（Elevation Finder）
🗣️ 情景例句
And I'd also like to thank my math teacher
我还要感谢我的数学老师
Walk, don't run, to the nearest exit.
从最近的出口出去，别瞎跑。
What's matter?
怎么回事？