The hematite can be better dispersed with the increase of stirring speed in a range, but the dispersion becomes worse when the stirring speed exceed a critical value.

在一定范围内增强搅拌强度有利于微细粒赤铁矿的分散，但搅拌强度超过某一临界值后分散效果变差。

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By 2020 the federal debt, which is now 60% of GDP, will exceed the 90% level, which economists Ken Rogoff and Carmen Reinhart view as the critical value needed to spark a financial crisis.

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