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也不知是你不屑干这样事呢，还是你根本就是笨，学不会。Let's understand such a problem first, If our front-end development needs are the needs given to us by the demand side, It is possible that a front-end developer will deal with multiple demanders, Therefore, it will keep in touch with multiple demand parties. Then in the program it means keeping references to multiple objects, The larger the program, There will be more and more objects, The relationship between them will become more and more complicated. Now if there is an intermediary (if it is our supervisor) to meet the needs of multiple demanders, Then the demander only needs to give all the requirements to our supervisor, who will assign tasks to us according to our workload in turn. In this way, our front-end development does not need to contact with multiple business parties, we only need to contact our supervisor (i.e. Intermediary), which weakens the coupling between objects.It is worth noting that the clockwise direction of the famous city line is called "right return" and the counterclockwise direction is "left return". In addition, it can be seen from the figure that the famous city line divides into two lines at Jinshan Station 1 in the counterclockwise direction, one to Nagoya Port and the other to continue to advance counterclockwise. The line to Nagoya Port is called "Minggang Line". Attention should be paid to the name of the line when taking the counterclockwise line.争得面红耳赤、口干舌燥之际，郑青木让人送了茶水点心进来，大伙儿便休战，歇息喝茶。　　王老爷是护宝人，为此他三十年未曾离开王家半步，因为高墙之外，夺宝之人也从未停止觊觎，更多敌人正源源不断从四面八方向此聚拢，更紧迫的是，日寇的战火已经燃起。I think that for today's him, the topic of the details of the battle at position 142 can also be stopped. I comforted him and finished the interview after a few words.