（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.
需要指出的是a设置所有用户的权限，这就相当于忽略它。
Specifying a sets the permission for all users, which is equivalent to omitting it.
multimethods本身是相当有用的，您可以下载它。
The module gnosis.magic.multimethods is perfectly usable by itself if you wish to download it.
为什么它的默认禁用超出我的，因为它实际上是相当有用。
Why it's disabled by default is beyond me, as it's actually quite useful.
虽然我仍未能收到来电，它仍然是一个相当有用的服务。
Although I haven't been able to receive incoming calls, it is still a pretty useful service to have.
它赋予您那台“慢吞吞”的老机器以崭新的使命，变成网络里相当有用的一员。
It can turn your not - so - fast machine of yesteryear into a useful subject of your network, and give it a new purpose in its short life.
高速缓存日志也可能变得相当大，因为您的所有用户都将对它产生影响。
Cache logs may also get fairly large, because all your users will be contributing to it.
高速缓存日志也可能变得相当大，因为您的所有用户都将对它产生影响。
Cache logs may also get fairly large, because all your users will be contributing to it.
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