The final required attribute is duration, which specifies the time for this animation step in milliseconds.

最后一个必需的属性是duration，该属性指定动画所经历的时间，以毫秒计。

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The final required attribute is duration, which specifies the time for this animation step in milliseconds.

最后一个必需的属性是duration，该属性指定动画所经历的时间，以毫秒计。

youdao