There is no warning, no presage, perhaps you are waiting for a genuine youth, age will not be used to divide, perhaps you would say: maintain their youth! Or: say bye bye to it!

没有任何的警告，没有预兆，也许你在等待一个真正的青春，不会用年龄来定义的，也许你会说：永葆青春！

youdao

It is not always easy to say "bye-bye" to middle school.

对中学说“再见”并不总是容易的。

youdao

Please say bye-bye to you Mummy (Daddy).

请向妈妈（爸爸）说再见。

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"I don't know anybody could be such a hound dog not to want to say good-bye,"

VOA: special.2009.11.14

We'll say good-bye to him here in our course.

本课程中,我们要跟他再见了

耶鲁公开课 - 聆听音乐课程节选

"Well,boys," Smith began, "here's where we say good-bye.

VOA: special.2009.12.12

Just don't be surprised when you want to cry yourself a river as you say Bye, bye, bye to this sexy boutique hotel.

BBC: Daily deal: Atlantic City glamour

Say "Bye Bye, Birdie" to another dull destination and "Hello Dolly!"

BBC: Daily deal: Bright lights and big laughs in AC

She shattered the power of British labor unions while forcing the Labour Party to say bye-bye to nationalized industry and hello to a severely reduced welfare state and free markets.

FORBES: The Iron Lady's Three Leadership Lessons