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想象一下,有一场拳击赛,A拳击手被限制只能在擂台的半边活动,B拳击手则可以全场跑,最后谁会赢?相信小学生也知道,赢面大的肯定是那个可以全场跑、不受陈规限制的B拳击手,因为他可以在A拳击手要进攻时,躲到他够不着的那一边。
Imagine a boxing match in which boxer A is restricted to half the ring while B boxer can run full and who will win in the end? Believe pupils also know that the winner is definitely the one who can run full time , A B-boxer unregulated by the rules because he can hide from the side where he is out of reach when A-boxers want to attack.