The nebula gets its name because optical images show dust obscuring some of the nebula's glowing gas in a shape reminiscent of the arcade character.
星云所以取得这个名称，是因为它们的光学图像显示了尘埃把一些星云的发光气体模糊化地形成了使人联想到拱形特征。
And in human growth and development process, the shape changes is also a very important element, it is not only the result of the development, but also of character.
而在人类的生长发育过程中，形态的变化又是一项非常重要的内容，它不仅是发育的结果，也是发育的特征。
Shape is the inherence characteristic of an object in the image, and it is the important character used for the object recognition.
形状是图像中目标的基本内在特性，是用于目标识别的重要特征，因此基于形状的目标识别方法研究具有重要意义。
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