The happiest teens used digital media a little less than an hour per day.

最快乐的青少年每天使用数字媒体的时间略少于一小时。

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Ten minutes of activity per day is a good start, says Marcus Jackovitz, DPT, a physical therapist at the University of Miami Hospital.

迈阿密大学附属医院的物理治疗博士、理疗师马库斯·杰克维兹说，每天运动十分钟是一个好的开始。

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She says people would not even notice a difference in taste with three grams, or one-half teaspoon, less salt per day.

VOA: special.2010.01.27

Soldiers were expected to be able travel thirty kilometers per day, in full pack.

士兵一天可以行进30千米，在全副装备的情况下。

耶鲁公开课 - 新约课程节选

The Government recommends that people have less then sixty-five grams of fat per day.

政府推荐,人们每天摄入少于65克脂肪

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Danhi and colleagues go through a whopping six to eight pork shoulders per day.

BBC: The LA food truck revival

Its 50, 000 members average 8, 000 trades per day, up from 3, 400 per day in March.

FORBES: Picking Winners

Or that obese people sit for more than two and half more hours per day than thin people?

BBC: Overweight frequent flyers