这不一定是坏事：这是美国失业率长期比较低的一个原因。

That is not necessarily a bad thing: it is one reason why America's unemployment rate is also usually lower.

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通过对低铝水平生产和高铝水平生产的长期比较，证明了高铝水平对电流效率的提高具有非常重要的作用。

Compared between low and high aluminum level production, it is proved that high aluminum level was very important to improve the electric current efficiency.

youdao

对于工作负载而言，这种模式比较少见。通常，长期存活的数据要么从不更改，要么频繁更改。

This is an unusual pattern for a workload; generally, long lived data is either almost never changed or changed frequently.

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