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You already know that frictional expenses can make buying and selling stock in rapid-trading fashion seriously lower your returns. 你已经了解了摩擦性成本会导致快速交易方式中买卖股票大大降低你的收益。 Still, there are times when you may want to part with one of your stock positions. 然而有时你可能想要舍弃一只股票。 How do you know when it's time to say goodbye to a favorite stock? 你怎么才能知道何时卖掉心爱的股票呢？ | 
