动力与机械，金钱与货物，只有令我们解放的条件下才是有用的。
Power and machinery, money and goods, are useful only as they set us free to live.
在新的研究中，研究者们设计并建造了一种机械翅果，它的动力与真正的翅果很像。
In a new study, researchers have designed and built a mechanical samara whose dynamics are very similar to those of nature's samaras.
本课程是机械与动力工程学院研究生的一门选修课。
This course is an elective course for graduate students in School of Mechanical Engineering.
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