（如果您想获得更多有用的资料，请参阅 参考资料中的相关信息）从清单 4 中可以看到，它的使用方法是相当简单的。
(Many more are available -- see the list in Resources for some of these.) Its usage is pretty simple, as you can see in Listing 4.
虽然这依然相当简单，但是它的确多提供了一些有用的信息。
This is still rather simple, but it does provide some additional information.
不起作用的原因就是事实上出版商提供了相当有用的服务：他们编辑书，然后宣传它。
The reason it doesn't work is that the publishers do actually perform quite a useful service: they edit the book, then they publicise it.
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