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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.这部备受瞩目的科幻剧是由FOX电视台的金牌编剧J.J 艾布拉姆斯(J.J Abrams)操刀制作。由他制作的电视剧《迷失》以及电影《苜蓿地》都曾让科幻迷们大饱眼福，相信这一次也不会例外。 　　板栗说完，转头见秦淼不住淌眼抹泪的，一时愣住了。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.谁知这丫头手虽灵巧，大概没帮男儿束发过，看着容易的发式，到底手生，倒要板栗不住提醒，她领悟却也快。　　第七季还邀请了另外几名超人扮演者友情客串，为该剧增色不少，定能让观看者激动不已。