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What we understand is that if a single schema is instantiated, it will only be instantiated once. To implement a single schema, we simply use a variable to identify whether the class is instantiated. If it is not instantiated, then we can instantiate it once. Otherwise, we will directly return the instantiated object.想不到这么多年过去，汪直的船依然停靠双屿。1970年代初，南越敌舰不顾国际法约束，经常窜入我西沙海域骚扰，严重影响我边疆渔民海上作业。居住在西沙群岛的于化龙（唐国强 饰）一家祖祖辈辈生活在这里，一天，正在海上捕鱼的一家人遭遇闯入我领海的南越10号舰，阿爸（高保成 饰）驾渔轮和敌舰展开周旋，但最终渔轮被敌舰撞翻，全家人落入大海。幸而被我赶来的海军救起，于化龙决定报名参军，保卫祖国海防。入伍后，于化龙从一个普通水兵成长为舰长，上级命令严惩不断入侵的南越舰艇，于化龙的阿爸和妹妹（洪学敏 饰）也参加了海战。战斗中，我舰中弹受损，于化龙急令修复，并一举收复了甜水岛，击溃了登岛的敌人，敌舰长也命丧黄泉......BIM is more and more widely used in the construction industry. Based on various relevant information data of construction projects, building models are established. By adopting BIM, construction companies can use consistent information to design and optimize projects throughout the process, and can also support better communication through visual appearance, so that all parties to the project can understand the cost, construction period and environmental impact. BIM supports architects to better predict the completed buildings before construction, so that they can maintain their competitive advantage in today's increasingly complex business environment.徐家正是个不错的选择，作为山阴四大家族之一，在越国地方势力之中有着举足轻重的地位。戚继光也知道拖得太久了，再拖下去也不合适了，逐渐露出正色，大丈夫，顾不及儿女私情，当舍便舍。