Those who began smoking within a month of the study's start were four times as likely to be depressed at the study's end than those who did not begin smoking.

那些在研究开始后一个月内就开始吸烟的人在研究结束时抑郁的可能性是那些没有开始吸烟的人的四倍。

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In response, a number of economists began forecasting that housing would hit a bottom in late 2011, then begin to recover.

面对这种情况，多位经济学家开始预测房市将会在2011年末触底，然后开始复苏。

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Recently, the SEC began to require 500 of the largest public companies to begin filing their financial statements using XBRL.

最近，SEC开始要求500家最大的国有公司使用XBRL填充它们的财务报表。

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There was this sense shortly after June 17th when same-sex couples could begin marrying and did began marrying that no one would vote to take away rights that were clearly established.

NPR: California Gay Leaders Assess Marriage Defeat

Indeed, we're beginning to believe that the market may just be catching up to our understanding that investment in fiber-optic capacity would once again begin to grow as longer-haul networks reached uncomfortable capacity constraints and telecom carriers began to invest more seriously in their long-term viability.

FORBES: Magazine Article

The Israelis insist the period of calm has yet to begin, while Mr Arafat said the seven-day countdown began last Wednesday.

BBC: News Online