Ffd
[医][=focal film distance]焦点胶片距离
🗣️ 情景例句
I should have saved some money.
我早该存些钱。
It's a long story.
说来话长。
Oil rigs have to be repaired frequently and divers,who often have to work in darkness a hundred feet under water,
钻井平台需要经常修理，潜水员常常要在水面100英尺以下摸黑工作，