某些器官，如胃、心和肝没有成对，或者说是单个的。

Some organs, such as the stomach, heart and liver, are unpaired, or single.

youdao

当你的胃空空如也的时候，你是不可能集中注意学习的。

You cannot pay attention on an empty stomach.

youdao

健胃剂，开胃剂：一种化学药剂，如内服药，能够加强胃功能或促进胃消化。

An agent, such as a medicine, that strengthens or stimulates the stomach.

youdao

健胃剂，开胃剂：一种化学药剂，如内服药，能够加强胃功能或促进胃消化。

An agent, such as a medicine, that strengthens or stimulates the stomach.

youdao