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The most dangerous man to any government is the man who is able to think things out for himself.
种树的最佳时间是20年前。第二好的时间就是现在。
Science is a wonderful thing if one does not have to earn one's living at it.
解释:局势安定的国家,常常是富足的;局势 动乱的国家,常常是贫穷的。
A true mathematician is always a student, always learning.