Update Site提到：
Welcome to the Eclipse Update Site. This site contains feature and plug-in versions for Eclipse project releases, published in the form expected by the Eclipse Update Manager (R3.0). Use the Update Manager's Feature Updates view to open this site (http://update.eclipse.org/updates) to locate new and updated Eclipse project feature versions to download.
Eclipse 3.1.1 Update Site：
http://update.eclipse.org/updates/3.0
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