有些问题的解答,如果从已知条件向所求的结果顺着思考下去,解答起来比较困难;但是如果从结果出发,倒过来思考,解答起来就容易得多。这种倒着思考问题的方法,就叫做倒推法。下面是用倒推法解决问题的两个实例。 The solution to some problems is more difficult to answer if the results from the known conditions are followed. However, if you start from the result and think it upside down, it is much easier to answer. This method of thinking backwards is called pushback. Here are two examples of problem-solving techniques.