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T-19：turn one's back on somebody 拒绝帮助
A:Would you mind taking me home? A:送我回家好吗？
B:Oh, I... B：哦，我……
A:Don't turn your back on me. I need your help. A:别拒绝我，我需要你的帮助。
B:All right. B：好吧！
