级别(通常有16个)本质上是快捷键，用于在压缩时限制不同的视频组件。
The levels, of which there are 16, are essentially shortcuts to constrain different video components when compressing.
安装程序限制哪些用户能够解压缩文件。
The installer had restrictions as to which user extracts the file.
如果开发人员设置了不合适的限制，译文要么被截断，要么被压缩的显示出来，同时，图片的加载也不会正常执行。
If developers set inadequate resizing limits, the translated text in a Web service will appear either truncated or as packed sardines, and the downloading of images will not perform well.
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