A simple way is to stick a clean finger in your mouth and scrape saliva from the back of your tongue. Put it on the back of your hand, wait a minute, then smell your hand.

一种简单的方法是放一根干净的手指到你的口腔里，再到舌头的背面去刮一点唾液，然后涂到手背上，一分钟后再闻一闻。

youdao

A simple way is to stick a clean finger in your mouth and scrape saliva from the back of your tongue. Put it on the back of your hand, wait a minute, then smell your hand.

一种简单的方法是放一根干净的手指到你的口腔里，再到舌头的背面去刮一点唾液，然后涂到手背上，一分钟后再闻一闻。

youdao