Many experts believe there are several reasons for this sudden increase in fires.

许多专家认为火灾的突然增加有几个原因。

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In Southern Spain, the sudden increase of greenhouses has changed the warming trend locally.

在西班牙南部，温室的突然增加改变了当地的变暖趋势。

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The fern spike is the term given to this sudden increase in the abundance of fern spores blown into the oceans around the world.

世界各地的海洋中，蕨类植物的孢子数量突然增加，这种现象被称为“蕨类植物峰值”。

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With the sudden increase in population in some villages, there is not enough food to feed everyone.

VOA: standard.2009.10.05

The sudden increase in jobs also underline the failure of easy money to stimulate growth.

FORBES: Less Stimulus, More Jobs

But, it was the sudden increase in visits by Millennial women that baffled Build-A-Bear staffers.

FORBES: The Bizarre Reason Build-A-Bear Workshop Has Become Popular Among Millennial Women

The greatest risk in the carry trade, however, is a sudden increase in long term interest rates.

FORBES: Bernanke To Banks: Unwind Your Carry-Trades NOW