This rotation means that only the most recently generated queries have orientations that are ‘up to date’ for estimating which keys are important right now. Prior work has confirmed this empirically: increasing the observation window for importance estimation does not help — performance peaks at around 25 queries and declines after that. With such a tiny window, some keys that will become important later get permanently evicted.
case "$REPLY" in
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维加斯队球员。图片来源：Ron Chenoy / Imagn Images / Reuters
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