The running wheel of the control group was fixed.

跑笼固定不转。

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The third group consisted of regular laboratory mice that had a running wheel.

第三组由有转轮的来自正规实验室的老鼠组成。

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The circle represent wheel, The small circle change into big circle is show the running wheel!

圆圈代表车轮，小车轮变为大车轮表现的是转动的车轮又远及近！

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Or, you can choose to keep working non-stop like a hamster running on a wheel that keeps going faster and faster.

CNN: Take your vacation, or die?

"Enough hamsters running on a wheel could displace a power plant, but no one's going to do it, because it's too expensive, " he says.

FORBES: Magazine Article

The open-wheel series is running a second, full-length race in the same weekend for the first time Sunday when Conway will start up front for the first time in his career.

NPR: Conway Wins 1st Of 2 Races At Detroit Grand Prix