...入一个时间参数elapsedTime即可，elapsedTime指的是从上一次loop的执行到当前loop所过去的时间，通常称之为帧时间（frame time），或者time delta。
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该函数按时间反向移动各帧，从图像序列的最后一幅到最前一幅。
This function moves each frame back in time from the last image in the sequence to the first.
因此，帧在时间上是反向播放还是正向播放，取决于按下了哪一个鼠标按键。
As such, consider making the frames play backward or forward in time depending on which button was clicked.
视频的多个时间帧有潜在的重叠，因此在呈现前的步骤中需要特别注意。
Drawing frames of video at various positions in time that are potentially overlapping requires special consideration in the pre-rendering steps.
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