意思是：图像压缩；
句子实例：
We're a bit cramped for space in this attic.
在这间阁楼里我们有点活动不开。
Our accommodation is rather cramped.
我们住的地方很挤。
All these difficulties cramped his progress.
所有这些困难阻碍了他的进步。
The swimmer got cramp in his legs and had to be helped out of the water.
游泳者两腿抽筋，不得不由他人救助出水。
