由于不存在指令链，任意一根发条的某个特定动作都会传递到整个系统，而系统的局部表现也更容易被系统的整体表现所掩盖。
Since there is no chain of command, the particular action of any single spring diffuses into the whole, making it easier for the sum of the whole to overwhelm the parts of the whole.
这个字段用于指定所有缓存机制在整个请求/响应链中必须服从的指令。
This field is used to specify directives that must be obeyed by all caching mechanisms along the request/response chain.
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