Videogames are exciting in large part because they take us somewhere else. For a few minutes (or, let’s be honest with ourselves, much longer), we become inhabitants of a virtual world. Creating these worlds is one of the supreme delights of being a game programmer.
视频游戏很大程度会让我们兴奋是因为它们把我们带到了其他地方。在几分钟（或者，坦率讲，时间更长）里，我们成为了虚拟世界的人。创建这些世界是作为游戏程序员的最高乐趣之一。
One aspect that most of these game worlds feature is time — the artificial world lives and breathes at its own cadence. As world builders, we must invent time and craft the gears that drive our game’s great clock
从一方面来讲，大多数游戏世界的特征便是时间--虚拟世界按照自己的节奏运行着。作为世界的建造者，我们必须创造时间和打磨用来驱动游戏巨大时钟的齿轮。（译者注：这里作者用了比喻来说明问题）
The patterns in this section are tools for doing just that. A Game Loop is the central axle that the clock spins on. Objects hear its ticking through Update Methods. We can hide the computer’s sequential nature behind a facade of snapshots of moments in time using Double Buffering so that the world appears to update simultaneously.
在本节中的模式便是用来做那样工作的工具。[游戏循环](03.2-Game Loop.md)是时钟旋转的中心轴，对象通过[更新方法](03.3-Update Method.md)来聆听它的滴答声。我们可以通过[双缓冲](03.1-Double Buffer.md)来及时的将计算机的连续性隐藏在时刻快照之后，从而使得游戏世界能够同步更新。
- [双缓冲](03.1-Double Buffer.md)
- [游戏循环](03.2-Game Loop.md)
- [更新方法](03.3-Update Method.md)