Over the past two years, it has deployed at least one of a new type of nuclear-powered ballistic-missile submarine called the Jin class and it may deploy as many as five more.

在过去的两年里，它开发出至少一种新型的核动力弹道导弹潜艇，称为“晋”级，并且可能开发出大约五种以上。

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Over the past five years, its volatility was 50 at one point and 15 at another.

在过去的5年当中，其波动率一会是50，一会又是15。

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Over the past year, a series of medical breakthroughs have brought five such magic-bullet pills one step closer to reality, aimed at diseases such as osteoporosis and type 2 diabetes.

最近一年来出现了一系列的医学突破，用于治疗骨质疏松、II型糖尿病等疾病的五种神奇药物因此可望更快面世。

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Nearly all the companies in the top 25 ran into a snag in at least one of the past five years.

ECONOMIST: A global ranking of companies

The decline in the number who prefer the death penalty as the punishment for murder may be related to the growing number who believe that at least one person in the past five years has been executed for a crime that he or she did not commit.

CNN: Executions, death sentences remain steady over past year

The reward: not only are the Ravens the only team to make the playoffs in each of the past five seasons, but they won at least one playoff game each time.

FORBES: Value Of Super Bowl Champ Ravens Soars Under Owner Steve Bisciotti