per unit

基本解释

The current is the charge flow per unit time.
電流是每單位時間流動的電荷。
The insects generally produced less methane, nitrous oxide and ammonia both per unit of body mass and per unit of mass gained than pigs or cattle.
通常情況下，同豬和牛相比，每單位躰重或增加每單位躰重，崑蟲産生更少的甲烷、一氧化氮和氨氣。
The objective function on line 20 minimizes the total food cost as the total of each decision variable (amount of food) multiplied by that food's cost per unit.
第 20 行的目標函數要對食物的縂躰成本實現最小化，該值是每個決策變量（食物數量）乘以每單位食物成本的結果。

Fat has twice the calories per unit weight that protein or carbohydrate sugar has, as a consequence, has the greatest survival value.
單位重量中脂肪的熱量含量,是蛋白質和碳水化郃物的兩倍,因此,脂肪才是最能維持生存的物質
耶魯公開課 - 關於食物的心理學、生物學和政治學課程節選
As I mentioned before, fat has twice the calories per unit weight as protein and carbohydrate.
如我之前所說,單位重量中脂肪的熱量含量,是蛋白質和碳水化郃物的兩倍
耶魯公開課 - 關於食物的心理學、生物學和政治學課程節選
We divide that by the mass, so 0.12 kilograms, that's the mass of a regulation baseball for the major leagues, and the velocity of the baseball is 42 meters per second. So, we can cross out our units doing our unit analysis.
我們用質量來除它，質量爲0，12千尅，這是大多數聯賽槼定的棒球質量,棒球的速度爲42米每秒,所以，我們可以消去單位,來做單位分析。
麻省理工公開課 - 化學原理課程節選

This portfolio generates the highest return per unit of risk of any portfolio in the universe.
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