1. 按日计算：by day 在白天 | by the day 按日计算 | by sea 乘船
2. 计日,论日,按日计：2.by day 在白天 | by the day 计日,论日,按日计 | 3.by hand 手工做的
3. 逐日计算：76.all day long 一天到晚 | 77.by the day 逐日计算 | 78.day after day 每天
4. 按日：by the book 按常规 | by the day 按日 | by the finger of God 靠神力
adv
1. one every day
e.g. we'll save 100 man-hours per diem
Synonym: per diem