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It is difficult to the point of impossibility for the average reader under the age of 40 to imagine a time when high-quality arts criticism could be found in most big-city newspapers.
it is 形容词 for sb to do sth. 对于某人来说做什么很困难，该句中为it is difficult for the average reader under the age of 40 to imagine a .....该句难点在于：to the point of --“到…地步”即不可理解的地步； 对于40岁以下的普通读者来说，去想象一个（定语从句）的时代很难，难到他们完全不理解的地步（也就是他们完全不理解那样一个时代）。