The worldwide prevalence of obesity has increased dramatically in the last several decades.

过去几十年里，世界各地的肥胖率已大大增加了。

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Over the last several decades, only Chinese fishermen were killed in several incidents by both Viet and Filipinos.

在过去几十年的几次事件中，只有中国渔民被越南人和菲律宾人的船杀死。

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Diagnostic medicine has progressed tremendously in the last several decades and provide new methods for detecting disease or physical impairment.

近几十年来，诊断医学有了极大的进步，为诊断疾病和检查身体的损伤方面提供了新的方法。

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"If you contrast what is happening in this crisis to what we saw in the last major global crises of the last several decades, I think you are seeing more action now on a broader scale,"

VOA: standard.2009.03.25

Last year,several scientists had expressed doubt about the possibility of the large Himalayan glaciers melting in a few decades.

VOA: standard.2010.01.23

Certainly that is what the data suggests has happened over the last several decades.

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The relationship of gold and oil prices for the last several decades is well-established.

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And we have seen that disadvantage grow and grow over the last several decades.

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