That is, studies have conclusively shown that when stock prices (or any price, for that matter) get overextended to the upside (or to the downside), they eventually fall back in line with averages.

研究表明，如果股票的价格(任何价格)过分上涨，它们最终要下跌到均值附近(过分下跌也是同理)。

youdao

By the fall of last year, the ratio had fallen back into line with historical norms in many parts of the country, the WSJ reported this week.

华尔街日报本周报道，到去年秋天，部分国家地区的这个比例已经下降到历史正常标准。

youdao

Impairments in recent years were largely an after-effect of the recession, and their figures should hence fall back in line in a year or two.

FORBES: Margin Recovery Gets Barclays To $18 A Share

Back in March, the company announced the Xperia SP and Xperia L handsets to fall in line behind its flagship.

ENGADGET

When the indexes began to fall, it was the large-cap leaders that were hit the hardest, as valuations had to come back in line with the more modest expectations of the time.

FORBES: Enhanced Index Funds: Can They Deliver Low-Risk Returns?