在被确诊患有 PTSD 的士兵中，有些变化是持久性的。

In soldiers diagnosed with PTSD, some of the changes are long-lasting.

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在圣何塞，这样的阶层流动更加困难，这引发了人们对这种阶层流动基本信念持久性的质疑。

That such mobility has become more difficult in San Jose raises questions about the endurance of that foundational belief.

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首先，必须确定持久性的需求。

First, the requirements of persistence must be determined.

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