Many of these were underutilized or misused during its two decades as the world’s lone superpower.

作为世界上孤独的世界大国，二十多年来这些牌都没有充分利用或者被误用了。

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During the last two decades, several new devices have come on to the market and more affordable prices for these have led to their increasing popularity in veterinary anaesthesia.

在过去的20年间，多种新的设备进入市场，以及可承受的价格使其在兽医麻醉中的应用增加。

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During these two decades, Mr. Walsh regained control of his life.

WSJ: Joe Walsh | Analog Man | An Eagle Flies Solo Once Again | By Jim Fusilli

While some studies have reported increases in European and North American storminess over the last two decades, these conditions during the twentieth century have been found not to be uncommon, even mild, compared with earlier times when temperatures and CO2 levels were lower.

FORBES: He's Baaack!: A Hot New Media Blast From Al Gore