• 1. Per-unit system: 单位系统 | 单位量制度
• 2. per unit system: 标幺值系统 | 单位法 | 标幺制
• 3. special per unit system: 特殊标么制

• 1.The communication of available functionality was critical since there were only three weeks per iteration to perform system test application design, code, and unit test.
  对可用功能的交流是至关重要的，因为每个迭代中只有三个星期是执行系统测试应用程序的设计、编码，和单元测试的。
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• 2.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。
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• 3.It is important that how to employ limited cultivable areas to make per unit yield attain maximum without influencing ecological system and controlling production cost.
  如何利用有限的耕地面积，在不影响生态平衡和控制生产成本的前提下，使单产达到一个新的水平，就显得尤其重要。
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