Earthquakes usually occur several days or tens of days after the F-content's return to the background value, and only few qua kes occur at the time of the maximum value of the F-content.

而地震常常发生在F -含量恢复背景值后数天或数十天，仅有个别地震发生在F -含量达最高值时。

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The results showed when social background variables is added into the earning, education return becomes obviously lower.

在收入方程中引入社会背景变量后，明显地降低了个人教育收益率的估计值。

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In the background of globalization, the float exchange rate system will return to the fixed one, in the form of currency unions.

全球化背景下浮动汇率制将以货币联盟的形式向固定汇率制复归。

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They openly talk about the Irish background, return home frequently, bring visitors to Ireland, hire Irish interns, keep their headquarters in Ireland, prod government ministers to change such-and-such a policy.

FORBES: Do Irish Immigrants to the Bay Area Feel Guilty for Living in Such an Amazing Place?

This will then occur in the background while they can return to their game.

BBC: PlayStation 4 console announced by Sony in New York

Gough explained the background to his belated return to Yorkshire.

BBC: Gough back as Yorkshire captain