现在，让我们来看看如何添加依赖插件，以及如何定义FIT插件将要扩展的扩展点。
Now, let's look at how you add the dependent plug-ins and define which extension points the FIT plug-in will extend.
通过添加依赖插件，Eclipse就知道了在加载您的插件之前应该加载哪些插件。
By adding a dependant plug-in, Eclipse knows which plug-ins to load before your plug-in.
这种努力显然需要对每个插件的manifest文件进行递归搜索，从而查明依赖插件的整个链条。
File. This effort obviously requires a recursive search into each and every plug-in manifest file to follow the complete chain of dependent plug-ins.
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