Ef
abbr. 每面（each face）；超精度（extremely fine）；仰角指示器（Elevation Finder）
🗣️ 情景例句
Yes, let me try. Oh, it's difficult. Will you show me how to do it?
好吧，让我试试吧！哦，真不容易。能教我怎么用吗？
A house divided against itself cannot stand.
家庭内讧难维系。
How did you decide that product was safe?
你怎样决定产品是安全的呢？