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在物理问题中,对于问题中的条件,大多数已知条件题目会直接给出,从题目中我们能很轻松地把它们找出来。但有一些条件(或者是其深层次的含义)不是直接给出,它可能隐藏在看起来“可有可无”的内容上,读者只有通过认真审题,才能把它挖掘出来。由于这种条件具有这样显明的特点,即隐藏在看起来“可有可无”的内容中,可称之为“灰色”条件。而在这一类问题中,“灰色”条件能不能被发现,能不能被好好利用,往往是解决问题的关键所在,请看下面的例题:
Among the physical problems, most of the known conditions are given directly for the conditions in the question, and we can easily find them out of the questions. But some conditions (or their underlying meaning) are not given directly, they may be hidden in what appears to be “dispensable”, and the reader can dig it out only through serious questioning. Since this condition has the obvious characteristic of being hidden in what appears to be “dispensable”, it can be referred to as the “gray” condition. In this type of problem, “gray” conditions can not be found, can be taken advantage of, often is the key to solve the problem, see the following example: