If you put a buzzard in a pen that is 6 feet by 8 feet and is entirely open at the top, the bird, in spite of its ability to fly, will be an absolute prisoner.

• 如果把一只蜂鹰放在一个长8英尺、宽6英尺，顶完全敞开的围栏里，尽管它能飞，但最终也会变成一个绝对的囚禁者。