a polite expression used when acknowledging a gift, service, or compliment, or accepting or refusing an offer
谢谢
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thank you for your letter 谢谢你的信
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no thank you, I'll give it a miss .不说谢谢了,我不来参加了。
an instance or means of expressing thanks:
感谢,感激
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Lucy planned a party as a thank you to hospital staff 露西筹划了一个晚会感谢医院的全体员工
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[as modifier]
thank-you letters .感谢信。