Services that are expected to run for a long time can be problematic to call using Ajax, but there can be valid cases for using them.

期待长期运行的服务来使用Ajax调用可能有问题，但是它们可能是有效的示例。

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However, after a very long time the component associated with the discrete spectra becomes dominant, and the results obtained by WKB method might no longer be valid.

但当在经过很长时段之后，由于和离散谱部分相对应的扰动占主要地位，WKB方法所得结论可能不再成立。

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This paper applies the long-time spectrum statistical parameters to the text-independent speaker recognition system, as more valid parameters with LPC together.

把频谱特征的统计参数应用于与文本无关的说话人识别系统中，与LPC参数一起作为一种更有效的参数。

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"To have this kind of scientifically valid study that confirms a lot of what we as military spouses have been saying and noticing for a long time, it's nice, " she said.

CNN: Study: Military teens have more stress