Iff
[计] 如果仅仅, 当且仅当, \等价\
🗣️ 情景例句
We stuff them.
我们装传单。
If you want some shoes, look under the bed.
如果你要鞋子，就在床底下。
She does, doesn't she! I read she's twenty-nine,- but she must be at least forty.
是的，谁说不是呢！我从报上看到她是29岁，但她一定至少有40岁了。