Fdi
abbr. 飞行方向指示器（Flight Direction Indicator ）；世界牙科联合会（Federation Dentaire Internationale）
🗣️ 情景例句
do I really have to
我是不是真的有必要
Math is beyond me.
我对数学无能为力。
It took him a little time to fix that watch.
他很快就把表修理好了。