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For easier management, We can also create custom chains in a table, Place the rules set for an application in this custom chain, But custom links cannot be used directly, It can only work if it is called as an action by a default chain. We can imagine that, Custom chain is a relatively "short" chain. The rules on this "short" chain are all formulated for an application program. However, this short chain cannot be directly used, but needs to be "welded" on the default definition chain of IPTables before it can be used by IPTables. This is why the default definition "chain" needs to refer to "custom chain" as "action". This is a later remark. We will talk about it later. We can understand it more clearly in actual use.3. Some classes, such as the core trading engine of the exchange, control the trading process. If multiple classes can be created, the system will be completely messed up. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process.　清乾隆年间，红花会舵主于万亭与四当家文泰来趁乾隆皇帝狩猎之际，面呈载有乾隆卑微身世的陈夫人遗书抄本，要挟乾隆与红花会结盟、反清复明。乾隆暗遣张召重杀死于万亭，将文泰来捕获。于万亭义子陈家洛继任舵主，率众前往营救文泰来。不看，就算糟蹋原著角色，也不是这么糟蹋的。约两个月后的12月24日。1. Operational Strategy