统一这些策略的一个公共原则是：解决通用问题比解决比较特定的问题更容易。
One common principle that unifies several of these is that it can be easier to solve a general problem than a more specific one.
像素的信息比像素本身的值最终需要的内存要少，而且这样在网上进行视频流的传输会比较容易。
Information about pixels ends up taking up less memory than the values of the pixels themselves, which makes it easier to stream video over the Internet.
这是比较容易保持关闭英镑，比有采取将它们赶走。
It is easier to keep off the pounds than to have to take them off.
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