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There is no such thing as a quality problem. There are only problems, and the solutions to those problems may involve quality considerations.
内心的平和是最好的财富。
释义:人的一生就像是一场梦,总没有醒来的时候,而戏言中的故事却总能让人们从梦中醒来。 
The greatest theorems often start as simple conjectures, born out of intuition.