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Lunch is on me. 午饭我请客
当有好事值得庆祝,而且你愿意买单时,可以用"Lunch is on me."表示“午饭我请客”。例如:Ben : I got a promotion. Lunch is on me.本 :我升职了,午饭我请客。Terry : It’s great.泰瑞 :太棒了。