Rotating injecting powder was doubling effect of injecting powder and mini bubble refining.

旋转喷粉具有喷粉和微气泡精炼双重效果。

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The crystal has the advantage of powder frequency-doubling effect, and can not be easily deliquesced and dehydrated. Moreover, the operating conditions can be easily realized.

该晶体具粉末倍频效应，不易潮解，不易脱水等优点，操作条件易实现。

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Doubling parental income would barely reduce dropout rates of the children. It would have a small effect on reducing teen pregnancy. It would barely improve child outcomes overall.

父母的收入加倍几乎不会降低子女的辍学率，对减少青少年早孕的效应也很小，整体上也将不太会改善孩子的最终状况。

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There are rumours that Greek banks have also been keen sellers of credit-default swaps on sovereign Greek debt, in effect doubling up on their exposure to a debt crisis.

ECONOMIST: Sovereign risk and the banks

But the deal, in very Brazilian fashion, allowed working civil servants to draw a pension of up to the same value as the proposed maximum wage, in effect doubling their maximum earnings.

ECONOMIST: Brazil

For we do know very well what is the direct effect of a doubling of greenhouse gases.

FORBES: Maybe Climate Change Just Really Isn't A Problem After All?