Iff
[计] 如果仅仅, 当且仅当, \等价\
🗣️ 情景例句
She's a really fantastic girl.
她真是个了不起的女孩。
I assume you've decided against buying a new car.
我假设你决定不买一辆新汽车。
Is it in one of your pockets ?
那张纸在你的口袋里吗？