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Sometimes you have to be a little bit naughty.
If you want to grow, you must be willing to adapt.
The farmer is the only man in our economy who buys everything at retail, sells everything at wholesale, and pays the freight both ways.
The pursuit of mathematical knowledge is a journey that never ends, filled with endless curiosity and wonder.
想让小孩子在旅行中表现良好,可以准备一袋他们喜欢的糖果,当他/她不乖时,就向窗外扔掉一块糖。