Usages of zàijiàn
在 火车站 跟 朋友 说 再见 的 时候， 她 先 哭 了 一会儿， 后来 又 笑 了。Zài huǒchēzhàn gēn péngyou shuō zàijiàn de shíhou, tā xiān kū le yíhuìr, hòulái yòu xiào le.
When saying goodbye to her friend at the train station, she first cried for a while and then smiled again.
下班 以后 我 跟 同事 说 再见。xiàbān yǐhòu wǒ gēn tóngshì shuō zàijiàn.
After work I say goodbye to my coworker.
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