The contestants must never have been married or had children and must be at least 18 years of age and under 27 years of age by Feb. 1 of the competition year.

参赛选手必须从未结婚或从来生育，年龄截止参赛年的2月1日之前必须处于18岁至27岁之间。

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The study appears Dec. 21 in the online version of the journal Cancer, and will appear in the Feb. 1 print edition.

这项研究发表在12月21日的《癌症》杂志网络版，并会出现在2月1日的印刷版上。

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Japan's Hinode sun-watching satellite photographed the sun's two coronal holes on Feb. 1.

2月1日，日本的日之出太阳观测卫星拍摄了太阳的两个日冕。

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Before Feb 1, I was feeling overwhelmed and behind the ball on a few projects.

FORBES: How To Have A Frugal (And Fabulous) February

The biggest loser was Orexigen, whose obesity drug Contrave was rejected by the FDA on Feb 1.

FORBES: Biotech Busts And Breakthroughs For February

According to the project's website, 93% of the real estate for sale, or 444 of 475 properties on the market, had been sold as of Feb 1.

WSJ: German Project Aims to Save Energy