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Initially, we could only animate with GIF image files.
起初，我们只能用GIF动画图片。
youdao
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These properties are often tricky to animate with CSS.
处理这些属性对CSS动画而言通常是相当棘手的。
youdao
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These properties are often tricky to animate with CSS.
处理这些属性对CSS动画而言通常是相当棘手的。
youdao