squirrel cage
noun
1- a rotating cylindrical cage in which a small captive animal can exercise as on a treadmill（有踏轮的）鼠笼。
1.1
- a monotonous or repetitive activity or way of life重复（或单调乏味）的活动（或生活方式）：
running madly about in a squirrel cage of activity.
在一项单调乏味的活动中拼命地忙碌。
1.2
- a form of rotor used in small electric motors, resembling a cylindrical cage（小电动机的）鼠笼式转子, 鼠笼式回转轴。