One example is the fourfold increase in alcohol-related deaths that occurred between 1991 and 2002.

其中一个例子就是，1991至2002年间，与酒精相关的死亡增长了三倍。

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Using the virus to make the system assemble itself improves the efficiency of the oxygen production fourfold, Nam says.

使用病毒使这个系统进行自装配使得氧气生产效率提高了四倍，南说。

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THE amount of plastic thrown away by Americans increased fourfold between 1980 and 2008.

从1980年到2008年，美国人丢弃的塑料的量翻了四番。

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The 83.9% year-over-year growth in net income in the most recent quarter came after the more than fourfold profit growth in the fourth quarter of the last fiscal year and the 94.3% rise in the third quarter of the last fiscal year.

FORBES: Earnings Preview: Pitney Bowes

Net income fell 1.3% in the second quarter from the year earlier, while the figure rose 83.9% in the first quarter, more than fourfold in the fourth quarter of the last fiscal year and 94.3% in the third quarter of the last fiscal year.

FORBES: Earnings Preview: Pitney Bowes

The past year saw a fourfold increase in the number of actual or attempted terrorist attacks in the United States.

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