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

Think of this as the percentage move per day.

这个就是每天的移动百分比。

麻省理工公开课 - 计算机科学及编程导论课程节选

Dialysis is done millions of times per day in this country and around the world, and keeps people alive when their kidneys have failed and they wouldn't survive for even a week without dialysis.

在美国乃至全世界,每天进行着上百万次的透析,肾脏丧失功能的病人靠透析得以存活,如果没有透析他们活不过一个星期

耶鲁公开课 - 生物医学工程探索课程节选