Ef
abbr. 每面（each face）；超精度（extremely fine）；仰角指示器（Elevation Finder）
🗣️ 情景例句
He keeps himself fit by running 5 miles every day.
他每天跑五公里以保持身体健康。
I'm sorry,but both of them are busy right now.
很抱歉他们现在很忙。
I went into her tent and she told me to sit down.
我走进她的帐篷，她叫我坐下。