每个笼内的老鼠都会小心地探寻整片地方，估量可能存在的危险。
In such a case, a rat will generally explore the meadow cautiously, assessing the risk of staying there.
他们将野鼠放入笼内，令猫缓缓接近它们，并仔细地观察每个笼子内老鼠的反应。
They put wild rats in cages and then brought cats gradually closer to them. At each stage, they carefully observed how the rats reacted.
亨特博士多次做这种实验，他总是没有按固定顺序随便打开任何一盏灯，在把老鼠释放出鼠笼前等候的时间间隔也完全不同。
Hunter did this experiment many times. He always turned on the lights in a random order. The rat had to wait different intervals before it was released from the cage.
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