After China joined the WTO, the domestic animated drawing will face more severe challenges and tests.

中国正式加入WTO后国产片将面临更为严峻的挑战和考验。

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Mechanics principle is the theoretic foundation of animated drawing design, especially, gravity, air resistance, ground friction force and inertia force, elasticity principle are used abroad.

力学原理是动画设计的理论基础，其中重力、空气阻力、地面摩擦力以及惯性力、弹力原理在动画设计中运用较多。

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On each page, the artist changes the figure slightly so that when you flip rapidly between sheets, the drawing appears animated.

在每一页上，艺术家的数字略有变化，当你迅速翻转板之间，绘图显示动画。

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For artists the animated GIF is a format to experiment with movement in graphic design, photography, painting, drawing, etc.

FORBES: How To Make Money Off The Animated GIF Comeback