A medium-sized dog will devour at least one can of food plus biscuits per day.

一只中等大小的狗每天至少要干掉一罐食物外加饼干。

《柯林斯英汉双解大词典》

Before, Demand usually served up tens of thousands of assignments per day: one day last year, it had a backlog of 150, 000 available assignments for writers, editors and videographers.

以前，按需媒体通常每天发布成千上万个任务：去年每一天，它都有15万个任务可派给写手、编辑和视频制作人员。

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We'll be posting one trend analysis per day.

我们每天会发表一篇趋势分析文章。

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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

But nearly one-half of its people live on less than $1 per day.

VOA: standard.2009.10.19

"You don't have to do all of your exercise in one setting. You could break a 30 minute per day recommendation into three 10 minute bouts of exercise."

VOA: standard.2010.02.26

Also, a police patrol may get two calls per day in one Moscow district, and 20 in another.

FORBES: And You Thought The U.S. Was A Police State...

Consider that they sneak out for 10 minutes six times or more per day, that's one hour at least per day.

BBC: Clocking cigarette breaks: Your comments

And 7.5% of the population were reported as heavy drinkers--adult men that have more than two drinks per day, or adult women who have more than one drink per day.

FORBES: Magazine Article