【买单表达】①This is my round. 轮到我付钱了。②It's my treat. 我请客。③I39;m buying. 我来买单。④Let go dutch. AA吧。⑤ It's on me. 我请客算我账上。⑥I39;ll pick up the check. 我来结账。⑦Shall we split the check 我们大家平摊?