The researchers scored five distinct mouse pain expressions. Eyes close and squint, nose bulges, cheeks bulge and mice also pull back their little round ears and move their whiskers.

研究者们找出了老鼠五种明显不同的痛苦表情：眼睛紧闭或斜视、鼻子鼓胀、面颊凸出、耳朵向后伸、胡须抖动。

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To eat dinner, I found that belly bulge, delicious food smell nose, stomach is full.

到了吃晚饭的时候，我才发现肚子胀了，香喷喷地饭菜闻到鼻子里，肚子就已经饱了。

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