There is one big difference here: We have to be careful about staleness.
这里有一个主要差别：必须注意时效性。
For each application, there is an acceptable level of "staleness" in the data.
对于每个应用程序，其数据都有一个可接受的“过时”程度。
For each application, there is an acceptable level of "staleness" in the data.
对于每个应用程序，其数据都有一个可接受的“过时”程度。
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