This is not surprising because the design of any flying vertebrate is subject to aerodynamic constraints.
这并不奇怪，因为任何会飞的脊椎动物的设计都受到空气动力学的限制。
When negative space is a landscape scene, a subject such as this boy who seems to be almost flying, not only stands out but also evokes a large degree of emotion.
此处的留白是风景，在其衬托下，男孩这一对象仿佛在飞翔，不仅引人注目，而且唤起丰富的情感。
The attitude coordination control problem for formation flying satellites associated with time-varying reference attitude tracking subject to control input saturation is investigated in this paper.
本文研究了跟踪时变参考姿态情况下的控制输入饱和的编队飞行卫星姿态协同控制问题。
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