'So this is goodbye,' she said ruefully.

她悲伤地说：“那么，这就是告别了。”

《牛津词典》

"This is goodbye, isn't it?" she said quietly.

“这就算告别了，不是吗？”她轻声地说道。

《柯林斯英汉双解大词典》

Let's have a party to say goodbye to her if she is free this weekend.

如果她这个周末有空的话，我们举行一个聚会向她告别吧。

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"This is a very bittersweet goodbye for me because the kids are already missing it, " Kate Gosselin said.

CNN: Jon and Kate close out 'Plus Eight'

"This is the time when we have to say goodbye to our friends, our colleagues, the excellent crew of shuttle Atlantis that did an excellent job performing three EVAs, installing the new Russian module, having good fun, enjoying living on the station and working in space, " the ISS Expedition 23 commander Oleg Kotov told Ken Ham, who leads the Atlantis crew.

BBC: Atlantis set for 'final' return

If this describes you, the greatest danger inherent in saying goodbye is free time.

FORBES: The Right Way To Say Goodbye To Your Business