At the beginning of the study, the runners ran for about four hours a week on average.
在研究开始阶段，坚持跑步的平均每周要跑上4个小时。
However, the study points out that even with this increased risk, the absolute risk of developing VTE, if seated and immobile for more than four hours, remains relatively low at about 1 in 6000.
但是，研究指出，即使伴有这一增加的风险，如果坐着不动超过4小时，罹患静脉血栓栓塞的绝对风险仍然相对较低，约为6000分之一。
For the study, participants, mainly young, uninsured women, gave urine samples before and after working at least four hours.
参加这项工作的主要是年轻未保险的女性，她们提供上班前和上班至少四小时后的尿样。
Some even pursue for money at the expense of sacrificing their study, thus their four- year's precious college hours turn out to be fruitless.
有些人甚至以牺牲学习为代价追求赚钱，以至于他们宝贵的四年学习生活成为无结果。
In the study, the researchers kept animals awake for 20 hours per day followed by a four-hour sleep opportunity, over five consecutive days.
在这项研究中，研究人员让动物每天清醒20小时，然后给4小时时间睡眠。
In the study, the researchers kept animals awake for 20 hours per day followed by a four-hour sleep opportunity, over five consecutive days.
在这项研究中，研究人员让动物每天清醒20小时，然后给4小时时间睡眠。
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