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It's been nice talking with you.和您谈话非常愉快.
Say hello to your sister for me.代我问你姐姐好.
Send my regards to your family.代我问你全家好.
Take care. Bye!多保重,再见!
Keep in touch.保持联络.
I won't take any of your time.我不再占用你的时间了.