玛雅故土的降雨量在不同年份是变化莫测的；最近几年的降雨量比其他年份多三到四倍。

Rainfall in the Maya homeland is unpredictably variable between years; some recent years have had three or four times more rain than other years.

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事实上，由于频率较低，在射频接触水平相同的情况下，人体从调频收音机和电视吸收的信号比从基台吸收的信号要多四倍。

In fact, due to their lower frequency, at similar RF exposure levels, the body absorbs up to five times more of the signal from FM radio and television than from base stations.

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它拥有的工厂比克莱斯勒多，员工数量是克莱斯勒的四倍，交易商数量是其两倍。

It has many more factories than Chrysler, nearly four times as many employees and twice as many dealers.

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