最底层的Card OS（操作系统）和Native Functions（基本函数），负责低层的处理工作。
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Call native functions by using platform invoke.
使用平台调用调用本地方法？
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Native functions, in turn, call other native functions.
反过来，本机函数又调用其他本机函数。
Write an SPL application that USES the native functions.
编写一个SPL应用程序来使用这些本机函数。
What you see in the diagram above is that the framework maintains the in and out points of the WebKit flow, but takes a detour in the middle using its own physics engine, render engine and rules framework to replace the native WebCore functions.
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Even here, actions like plugging into Facebook and interfacing with native Cocoa Touch functions are slightly different in each of these realms.
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