She must know the play backwards by now.

她现在对这个剧本肯定是倒背如流。

《牛津词典》

Plays the ValueAnimator in reverse. If the animation is already running, it will stop itself and play backwards from the point reached when reverse was called.

也就是说这个方法其实是反转动画，如果动画正在播放，这个方法停止动画，并从当前点往回播。

youdao

But her good work was undone when she drove into a fairway bunker on the last and she was forced to play backwards.

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The new 3DS device is expected to be backwards compatible, allowing it to play DS and DSi games.

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