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Then look at branches 2, 3, 4 and 5 in the figure. As can be seen from the previous Android event distribution flow chart, they can reach the same conclusion, so they can be regarded as a situation.如张家郑家这样的，便是大圆几了。Next, we will talk about the responsibility chain mode. There are multiple objects, each of which holds a reference to the next object, thus forming a chain on which requests are passed until an object decides to process the request. However, the sender does not know which object will process the request in the end, so the responsibility chain mode can be implemented to dynamically adjust the system without concealing the client. Let's look at the diagram first:听到韩信这样说，蒯彻总算是松了一口气。This paper introduces the general setting method of Word column division, explains some problems encountered in Word column division, and also introduces the setting method of displaying multiple page numbers on one page after Word column division.