2 sentences for 一回事 (yī​huí​shì — same thing)

1. 那个包包是怎么一回事？

   nà gè bāo​bāo shì zěn​me yī​huí​shì?

   What's with that bag?

   Source: OpenSubtitles

2. 这两件案子其实是一回事。

   zhè liǎng jiàn àn​zi qí​shí shì yī​huí​shì.

   These two cases are actually the same thing.

   Source: Dong Chinese Dictionary