比如，猕猴也是具有高度社会性的动物，科学家把他们放在笼子里并教他们学会怎样推动控制杆得到可卡因。
For example, macaque monkeys are also highly social animals, and scientists put them in cages and taught them how to push a lever so that they could get cocaine.
研究人员训练老鼠去推动控制杆，推动之后能得到两种报酬中的一种——推动第一个控制杆，就会渗出一滴糖水；
Mice were trained to push levers to get either of two rewards. Press one lever, out comes a drop of sugar water.
水位达到一定高度时，水将推动一个控制杆，从而显示时间。
When the water reaches a certain level, it moves a lever and this shows the hours.
在眼镜横梁上的滑动控制杆推动流体向前或向后，以改变那层薄膜的形状，从而根据用户当前的动作来调整焦距。
A slide lever on the bridge of the eyeglasses pushes the fluid forward or backward to alter the shape of that membrane, changing the focal distance depending on what the user is doing.
推动第二个控制杆，它们则能得到另一滴不同味道的糖水。
Press the other and they get a drop of different tasting sugar water.
至于一次可以转一度的步进马达，会在必要的时候来回推动百叶窗的控制杆。
A stepper motor, which can be turned a degree at a time, would twist the wand back and forth as needed.
推动第一个控制杆，就会渗出一滴糖水。
推动第一个控制杆，就会渗出一滴糖水。
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