Very little seems to have been done by these companies in the interest of sound quality for several years… possibly even decades.

一点非常好似由这些公司在品质优良的兴趣可能做几个几年… 甚而十年。

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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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February reflected the best one month improvement for these metrics in several decades.

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Its sin: legally dumping 1.3 million pounds of polychlorinated biphenyls into the Hudson River over several decades, until these chemicals were banned in 1977, then dragging its feet on the cleanup.

FORBES: Magazine Article

These policies also increased Uribe's popularity as Colombians feel safer today than in the past several decades.

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