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最好的买入股票的时机是当它便宜的时候,最好的卖出时机是当它昂贵的时候。
The best way to buy a stock is when it's cheap, and the best time to sell is when it's expensive.
The past is not a prison but a springboard.
世界是事实的总体,而不是事物的总体。
The essence of mathematics lies in its freedom.