她后悔那次酒吧邂逅只是一夜情，两人之后再无联系。

She regretted that bar encounter was just a ___one-night stand, and they never contacted each other again.

这位歌手在纽约只进行了一场一夜演出，然后就飞往欧洲了。

The singer only did a ___one-night stand in New York before flying to Europe.