Then, the periodic term and stochastic term are resolved based on additive model.

根据叠合模型可进一步分解出周期项和随机项。

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Some of the reasons are natural; California has been in one of its periodic droughts since 2006, and climate change is a long-term threat to the state's mountain snowpacks.

其中有自然原因：2006年以来，加州一直处于一个周期性干旱中，而气候变化是对州内山区积雪的长期威胁。

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However, the number of servers can also be increased to accommodate short-term spikes in traffic or decreased during periodic lulls.

但是，服务器的数量也可以增加以应对短期流量剧增，或在一定的间歇期间减少。

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And then this second term, if we go to the Periodic Table, 2 we will find that the value here for hydrogen is 2.2 98 and the value for fluorine is 3.98.

再算上第二个条件，翻看元素周期表，我们查处H，F电负性分别为2,2。2，3。

麻省理工公开课 - 固态化学导论课程节选

Although there will be periodic short-term recoveries in the yen of from 3% to 5%, the basic trend is set.

FORBES: The sinking yen

Specifically, it is time to revisit whether the viability of the deterrent can be assured over the long-term without periodic safe, underground nuclear testing.

CENTERFORSECURITYPOLICY: Are we serious about deterrence?

The stable monetary policy disciplined by fixed exchange rates also minimized the boom and bust business cycle, with its periodic sharp recessions hampering long term growth.

FORBES: The Monetary Foundations Of Economic Prosperity