A computer may not know good from bad, but if the factors that set good and bad apart are quantifiable (contrast, clarity, composition), then a computer can imitate that judgment.
计算机可能不知道好坏，但如果设置好的和坏的的因素多(对比度，清晰度，组成)，那么一台计算机可以模仿判断。
Not the same as the original life is not to know good from bad youth.
原来不一样的人生也有不知好歹的青春。
But it's not always easy to know a good book from a bad one.
但是从一本坏书中分辨出一本好书真是不容易。
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