This story was originally featured on Fortune.com
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.，详情可参考服务器推荐
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The U.S. leads the world in both crude oil and natural gas production, but the top exporters are already shipping near their capacities, allowing them to reap larger profits but not fill the supply gaps caused by the temporary loss of 20% of global oil and liquefied natural gas (LNG) volumes triggered by the effective closure of the Strait of Hormuz near Iran.