色彩在绘画中是十分重要而富有魅力的艺术语言，借助它可以在一个二度空间创造出丰富而独特的画面效果。
Color is an important and charming artistic language in painting, by which a colorful and unique tableau effect can be created in two dimension.
本文介绍了二度空间重力垂直一次导数的级数展开计算法。
The 2d series expansion algorithm of vertical first derivative of gravity is briefly stated in this paper.
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