另外，有效地评估可用性的方法也能帮上不少忙。 在本文中，我将定义并且着重讨论可用性的四个层面：易学性，简洁，效率，以及美感 [1] 。
It is also helpful to have concrete methods for analyzing usability, and in this article I'll define and focus four dimensions of usability: Learnability, Simplicity, Efficiency, and Aesthetic [1].
可用能理论是一种有效分析能量利用效率的方法。
Available energy theory is an effective method of energy efficiency.
在能量转移系统中，应该采用容积膨胀减压方式减少减压环节的可用能损失；合理利用低温排气的冷量火用可以提高气动发动机能量转移系统的总能量效率。
The expander can reduce exergy loss in pressure reducing process, and the utilization of cryogenic exergy of air-powered engine exhaust is useful to improve the total energy efficiency.
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