It can be used as placeholder to store the string values, which can be used later until the session is alive.
可以将它用作占位符来存储字符串值，稍后在会话处于激活状态时对其加以利用。
Rather than storing every pixel of every frame of video separately, video algorithms store information that can be used to predict the color values of pixels.
该版本不是对视频的每一帧的每个像素进行分别的存储，而是通过存储的信息来预测像素点的颜色值。
The CSS file can also be used to store the values of screen widths.
还可以使用CSS文件存储屏幕元素宽度值。
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