per unit area

常见例句

双语例句

• Let's use delta for density, which is the mass per unit area.
  我们用δ来表示密度，也就是每单位面积元的质量。
• The density for a flat object would be the mass per unit area.
  一个平面物体的密度是每单位面积元的质量。
• The other way to think about it is divergence is the source rate, it is the amount of fluid that is being inserted into the system, that is being pumped into the system per unit time per unit area.
  另外一个理解方法是，散度是源头的“冒出率”,它是流体往系统输入的量，也就是单位时间内，单位面积新冒出的流体。

权威例句

• But they also have the highest sales per unit area of any U.S. retailer, double that of Tiffany.
  FORBES: A Google Retail Store? Why It's Not As Crazy As It Sounds
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