因为这些星系的质量分布在更大的区域，它们每单位体积的恒星数量比传统星系要少得多。
Because these galaxies' mass is spread out over larger areas, they have far fewer stars per unit volume than do conventional galaxies.
在每单位资本支持的资产数量受到越来越多限制的银行业，股票走得不会太远。
And equity will go less far in a world where Banks are more constrained in the amount of assets they can support with each unit of capital.
第20行的目标函数要对食物的总体成本实现最小化，该值是每个决策变量(食物数量)乘以每单位食物成本的结果。
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.
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