在传统的二维动画，每一帧通常是由手。

In traditional 2d animation, each frame is usually drawn by hand.

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在学院里，我辅修了一门叫做二维动画的课。

In college I took a side subject called 2-d animation.

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给出一个用于二维计算机动画烟雾的模型。

This paper presents a model of smoke for 2d computer animation.

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给出一个用于二维计算机动画烟雾的模型。

This paper presents a model of smoke for 2d computer animation.

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