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Relatively speaking, the double-breasted belt is more stable than the single-breasted belt.For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.犹记得当年和英布大哥在一起并肩作战的情景，现在这点事情举手之劳，都是应该的。因车马行人众多，不方便住驿馆，板栗对当地官府的迎送也一概推拒，只说随人众多，不便搅扰等语。　　对 Chloe而言，与Lois的竞争失败并非最糟的事。她一边费力帮助Clark隐藏身份，一边要向Jimmy(Aaron Ashmore饰, "圣诞小屋") 隐瞒自己新生的超能力，她害怕Jimmy一旦获知真相便会弃她而去。然而，Chloe一再推迟调查报告的行为，以及她和Clark的关系，使得Jimmy 对两人的感情产生了怀疑，转而对Kara衍生好感。尽管Chloe在过去几年中一直鼓励Clark向Lana表明自己的真实身份，然而当自己面临同样处境 时，她却无法向Jimmy坦呈自己已被感染，唯恐Jimmy因此抛弃自己。在床上翻了几个滚后，陈启把东西摆放好，然后便坐在床上，打开电脑。Receiver: Receiver