During the experiment, the social robot rat followed the living rats around, played with the same toys, and opened cage doors to let trapped rats escape.

在实验中，社交机器鼠跟随生物鼠四处走动，与它们玩同样的玩具，还会打开笼门让被困的老鼠逃走。

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The rat looked around him.

老鼠环顾四周。

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Sure, I use d to be a typical mall rat hanging around watching the crowds, especially the girls.

这个年轻人说：“当然了，我过去是个典型的逛购物中心的迷，喜欢在那里观看来来往往的人，特别是女孩子。 可是，后来我去打篮球， 进了球队，这样我就没法再浪费时间了。

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While Mullen sympathises with those players who face an uncertain future, the beautiful game has, according to the League One boss, become an unsentimental rat race, with clubs scurrying around to cobble together a promotion-winning squad.

BBC: Football's free transfer rat race

Only the "queen" mole-rat reproduces, suppressing fertility in both the females and the males around her by bullying them.

BBC: NEWS | Health | Clues to stress-infertility link

If we distribute the rats evenly across the urban areas, which is clearly unlikely but necessary for the calculation, each rat has a rather spacious 5, 000 square metres to roam around in.

BBC: Are you never more than 6ft away from a rat?