The Chain of Responsibility pattern supports decoupling by passing a request between potential receivers, whereas the command pattern supports using a command object to encapsulate a request.

责任链模式通过在可能的接受方传递请求来解耦，而命令模式是通过将请求封装成对象。

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This pattern of rationalization and decreased responsibility is "very common, " says Patrick Lyden, MD, the chair of the department of neurology at Cedars-Sinai Medical Center, in Los Angeles.

CNN: Aging workforce means dementia on the job could rise

There's not always a claim of responsibility in attacks like this, but this does follow the pattern of Madrid in 2004.

NPR: Investigators Cautious on Assessing Blame for Attacks