Closed in cage like bird 似关在笼中的鸟儿
First the rat was placed in the closed cage. Next, on of the lights was turned on and then off. There was food for the rat only at this door.
首先，把大老鼠放到关着的鼠笼里，接着把其中一盏灯打开然后关上，只有在这扇门那里才有给老鼠的食物。
The free bird cries, "It cannot be, I fear the closed doors of the cage,".
自由的鸟叫唤说：“这是做不到的，我怕这笼子的紧闭的门。”
After he has closed the window, we open the cage door.
他关了窗之后，我们把笼门打开。
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