看什么目的吧，比如保护现货仓位就不是，美股不少人是这样的，因为盈利卖出要缴纳资本利得税，就买相当于持仓的put，没跌破行...

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      "A short note: 看什么目的吧，比如保护现货仓位就不是，美股不少人是这样的，因为盈利卖出要缴纳资本利得税，就买相当于持..."
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