If the request is for one of the nodes we know about, we pass that node to the printDOMTree method.

如果所请求的是我们知道的一个节点，则可以将这个节点传递给方法printdomtree。

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Before calling the method, you first check that there is at least one SQL warning; if so, you pass the first SQLWarning object to the appropriate method.

在调用这个方法之前，首先要检查是否至少有一个SQL警告；如果有，就将第一个SQLWarning对象传递给适当的方法。

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To launch one of these applications for the user, you pass the corresponding ID to the launch method.

将相应的ID传递给启动方法，启动对应的应用程序。

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