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CONVENTION
（告别用语）再见
You say 'Goodbye' to someone when you or they are leaving, or at the end of a telephone conversation.
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N-COUNT
告别语；道别；再见
When you say your goodbyes, you say something such as 'Goodbye' when you leave.
例句
He said his goodbyes knowing that a long time would pass before he would see his child again...
他道了别，知道要过很久才能再见到他的孩子。
I said a hurried goodbye and walked home in the cold...
我匆忙地说了声再会便冒着严寒走回了家。
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PHRASE
道别/ 挥手告别
When you say goodbye to someone, you say something such as 'Goodbye', 'Bye', or 'See you', when you or they are leaving. You can also wave goodbye to someone.
例句
He left without saying goodbye...
他不辞而别。
He wanted to say goodbye to you...
他想跟你说声再见。
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PHRASE
向…说再见；承认不会（或不再）拥有
If you say goodbye or wave goodbye to something that you want or usually have, you accept that you are not going to have it.
例句
He has probably said goodbye to his last chance of Olympic gold...
他可能已经失去了夺取奥运会金牌的最后机会。
We can wave goodbye to the sort of protection that people at work need and deserve.
我们就只能向工作的人所需要且应得的那种保护说拜拜了。