This doesn't seem like the first time that the same type of environmental disaster re-occurs in different locations. Is this purely a coincidence or not?
这似乎不是第一次了，同样的灾难在世界不同地区重复地出现，这到底是必然还是偶然呢？
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A phantom read occurs when a transaction re-executes a query and finds a set of results changed since the last query due to another transaction that committed new data.
Residual data occurs when instance resources previously allocated are not purged completely of the data before they are re-allocated to the same or different user.