The graphs show a threefold increase in the number of…

该图表剖明…的数目增添了三倍。

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This is despite a threefold increase in coal output, meaning that the death rate has plunged by about 80 percent.

与此同时，煤炭产量却增长了3倍，意味着死亡率下降了约80%。

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Over the whole planet, there will be a threefold increase in the average acidity of the oceans, which is unprecedented during the past 20 million years.

在整个地球，海洋平均酸度将增加三倍，这是在过去两千万年里从未发生过的。

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Please understand, we do not see a threefold increase in the money supply via the private banking system, here and now.

FORBES: Monetary Watch June 2011, Inflation prospects post QE II

Bosch reckons that for electric cars to become universally popular, a threefold increase in energy density and a fall of two-thirds in the price of batteries will be needed.

ECONOMIST: The electrification of motoring

The spokesman said Mr. Schultz's pay is tied to company performance and that his gains reflected a more than threefold increase in Starbucks's share price since he returned as CEO in 2008.

WSJ: As Tax Hikes Loomed, Some CEOs Sold Company Stock