... per day是介词+名词,为"介词短语",作补充性状语,强调单位时间。 every day是形容词+名词,为"名词短语"。名词一般不能作状语。 everyday是个副词,区别更大。做"时间状语",强调时间的频率。 ...
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Tones per day 每天装卸吨数 ; 天天装卸吨数
per hatch per day 每天每舱口 ; 每天每舱口装卸定量 ; 每舱口每天
barrels per day 每日桶数 ; 桶每天 ; 每天装卸桶数 ; 每日产油桶数
a song per day 每天一首歌 ; 天天一首歌
variation per day 日变量 ; 每天变化量 ; 每天变化量日变量
Martha would consume nearly a pound of cheese per day.
玛莎那时每天吃将近一磅奶酪。
The outpatient programme costs $105 per day, all inclusive.
门诊病人方案收费每人每天105美元,一切费用包括在内。
Your intake of alcohol should not exceed two units per day.
你每天酒精摄入量不能超过两个单位。
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
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。
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
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