更新一下映像，就可以引入multi-touch逻辑以及Objectiv-C的接口。
The image requires some updates to bring in the multi-touch logic, and the Objective-C bridge.
比如，想象一下，一个按一下按钮就可以进行发布的世界，而不是现在产生更新站点的方式。
For example, imagine a world where you could do push-button publishing instead of the current way of generating update sites.
在你更新一个变量之前，你要先初始化一下，一般就是简单赋值一下就可以了。
Before you can update a variable, you have to initialize it, usually with a simple assignment.
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