相對來說，SPY翻番的速度要慢很多，一定程度「逼迫」你長持。給人一種「無敵」的假象。

来源: buydip? 于 2020-01-05 12:26:17 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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