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.
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.
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