I did some Internet searching today, and apparently one can get gas (belching) from breathing with ones' mouth open because air gets into the esophagus.

我做了一些互联网搜索的今天，似乎可以得到气体(从打嗝的'张着嘴呼吸，因为空气进入食管获得)。

youdao

I did some Internet searching today, and apparently one can get gas (belching) from breathing with ones' mouth open because air gets into the esophagus.

我做了一些互联网搜索的今天，似乎可以得到气体(从打嗝的'张着嘴呼吸，因为空气进入食管获得)。

youdao