而对Ruby求解方法的利用，就是成功实现这种效果的关键。
The key to achieving this success is taking advantage of Ruby's evaluation methods.
这个教程将为你展示如何用CSS Sprites实现这种效果。
This tutorial will show you how to achieve that using CSS Sprites.
为了实现这种效果，要解决两个问题：首先，修改对象池，让它理解范围的概念。
To accomplish this effect, resolve these two issues: First, modify the object pool so that it understands the concept of scope.
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