Iff
[计] 如果仅仅, 当且仅当, \等价\
🗣️ 情景例句
Everything you have said is find by me.
你所说的我都同意。
No man is content.
人心是不满足的。
His work starts at half past eight, and finishes at a quarter to five.
30开始工作，4：45下班。