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。
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。
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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