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见他还懵懂，又道：你就是有些小聪明，遇见大事就不够瞧了。Centos7, The service is no longer started using init-style scripts, Instead, the unit file is used, Therefore, commands like service iptables start can no longer be used in centos7, Therefore, service iptables save cannot be executed. At the same time, firewall is used to replace the original iptables service in centos7, but don't worry, we just need to install iptables and iptables-services through yum source (iptables are usually installed by default, but iptables-services are not installed by default in centos7). After installing iptables-services in centos7, the rules can be saved by the service iptables save command, as in centos6, and the rules are also saved in the/etc/sysconfig/iptables file.《放学后福不福 第二季》沿用了之前的主演班底，但把拍摄地点搬到 了中国，长城、王府井等等北京地标 建筑都在其中有所展现。剧中还安排了模仿最近大热韩剧《来自星星的你》中的桥段。……吕文心发觉自己已经无言以对。可是他不同了，若是战败，他刘邦只有一个下场，和项羽一样，亡国之君只有一死。爾仔（吳肇軒飾演）女友茹可以（盧惠敏飾演）在法國工作假期計劃期間突然失蹤，爾仔守住可以留下的書店希望等對方歸來。及後書店生意每況愈下，爾仔為維持書店，於是接受好友拖羅（繆浩昌飾演）的意見，在書店開設「身後事務所」以增加收入，專責代處理逝者遺物，卻因此遇上亡魂，為死者解開心結。Iterator patterns are created for collection objects, For collection objects, It must involve the addition and deletion of collection elements, and certainly supports the operation of traversing collection elements. If the traversal operation is also placed in the collection object at this time, the collection object will bear too many responsibilities. At this time, the responsibilities can be separated and the traversal of the collection can be placed in another object, which is the iterator object.