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。

youdao

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。

youdao

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。

youdao