Ffd
[医][=focal film distance]焦点胶片距离
🗣️ 情景例句
Where do you work?, What school do you go to?
“你在哪工作？”，“你在哪儿上学？”。
Don't underestimate the difficulties of the work.
不要低估了这项工作的限巨性。
The men were now obliged to try once more.
工人们只得再来一次。