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Rather than fully removing the key from the map, we set the register value to null. The metadata is kept around so we can disambiguate deletions from states that simply don’t have a key yet. These are called tombstones — the ghosts of CRDTs past.，详情可参考体育直播
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During last year's MWC, Nothing launched two smartphones, the Nothing 3a and Nothing 3a Pro. Both were slick-looking, fairly affordable mid-rangers with big displays, big batteries, and a couple of Nothing-specific software features.