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万籁俱寂中，不知过了多久，也许只一会儿，远处传来脚步声。If we don't have a Computer class, then CPU, Memory and Disk will hold instances and generate relationships with each other, which will cause serious dependence. Modifying one class may bring about modifications to other classes. This is not what we want to see. With the Computer class, the relationship between them will be placed in the Computer class, thus playing a decoupling role. This is the appearance mode!该剧由《Broad City》的创作人Ilana Glazer、Paul W. Downs和Lucia Aniello打造，其中前两者兼主演。毫无疑问……这仍然是恶搞节目。在该剧中，一对表兄妹Jeff和Sharee（Paul W. Downs和Ilana Glazer）发现了一个印有中文字样「穿越烟壶」的魔法物品，只要吸上一口，他们就能任意穿越时空。他们原本在郊区过着波澜不惊的平凡生活，所住的公寓也是祖母馈赠的，这个「时间机器」的出现彻底改变了他们的命运！他们时间旅行的第一站是马萨诸塞州的塞勒姆……正赶上女巫大审判最激烈的时候。随后他们还去了上世纪六十年代种族隔离问题严重的南方，古希腊，甚至「反乌托邦」未来。糟糕的是，他们的「穿越烟壶」在一次旅行过程中摔碎了，他们被迫在时空间的「连续统一」中来回跳跃。他们最终明白了一件事——没有哪个时代强过「现在」，他们应该好好珍惜现实才对。该剧4月20日、21日、22日三晚连续播出。Public delegate void DoSth (object sender, EventArgs e);Answer: The similarity of these three modes is that they all serve as an intermediate layer between the client and the real used class or system, which plays the role of allowing the client to indirectly call the real class. The difference is that the application occasions and intentions are different.