Iff
[计] 如果仅仅, 当且仅当, \等价\
🗣️ 情景例句
Tonight's a problem. What about tomorrow night?
今晚不行，明晚怎样？
I think your industrial robots are the best in the field.
我认为你们的工业机器人在这领域是最好的。
Yes, said Miss Yang.they're on that shelf over there.
“有，”杨小姐说，“就在那边的那个书架上。”