First of all, many pupils suggest that history is one of the less interesting school subjects and that governments should spend the time and money on subjects that are more useful.
首先，许多学生认为历史是一门不那么有趣的学校科目，政府应该把时间和金钱花在更有用的科目上。
Another way to make daily builds more useful for reducing wait time is to prioritize what failures to fix first.
使每日的构建对减少等待时间更有用的另一个方法是对首先确定什么失败划分优先级。
While this is useful (and important!) information, you might be wondering why I took the time to mention it, when the focus is on using PDO with DB2.
虽然这是有用的(并且也是重要的)信息，但是您可能想知道，为什么我要花时间提到这一点，本文的重点不是结合使用pdo和db2吗？
Thinking of time as something you own is useful. Would you find it so easy to waste something if you knew you owned it?
把时间想象成自己拥有的财富是很有用的，因为这让你更容易意识到对它的浪费。
To compensate for this, the least-significant digit is removed from the end of a time difference resulting in a useful, but less specific data point.
为了弥补这个缺陷，从时间差异的末尾中删除最不重要的数位，得到一个有用但特定性较低的数据点。
On the other hand, if the lock is held for a longer time, spinning is wasteful as the spinning thread consumes CPU without doing anything useful.
另一方面，如果锁被占有很长时间，那么自旋的线程只会消耗CPU而不做任何有用的工作，因此带来浪费。
This is, of course, particularly useful when it takes a long time to start your application or to get to the point where it fails.
当然，当启动您的应用程序或找到出错点需要花费很长时间的时候，该功能极其有用。
It is expected that many useful extensions will emerge over time as developers begin to roll out new and interesting applications.
随着开发人员不断发现新的和有趣的应用，可以预料随着时间的流逝将出现很多有用的扩展。
This is a useful metric because some garbage collection is (for the time being) an inevitable fact of life for most applications.
这是一个有用的指标，因为一些垃圾收集器(当前)是大多数应用程序必须要面对的问题。
Patients do get one-on-one time with a doctor, but perhaps more useful is hearing how other patients dealt with similar struggles.
患者有机会与医生一对一的机会，但是更有用的是倾听病人怎样处理类似问题。
In fact, given that traditional economic forecasts miss structural breaks all the time, it is both difficult to achieve and useful.
事实上，考虑到传统经济预测始终忽略了结构性突变，这种预测不仅难度很大，也很有用。
ADC relies on the NSD output for much of its information, so if NSD is not configured to run at the time of a crash, there is little useful information in the ADC report.
ADC依靠NSD输出获得它的许多信息，所以如果在崩溃时没有将NSD配置为运行，那么在ADC报告中就没有多少有用的信息。
A credible inflation target of 2 or 3 per cent, maintained over a credibly long period of time, is useful.
在相当长的一段时期内，维持2%或3%这种可靠的通胀率目标，是有用的。
Another useful means of increasing office productivity using UNIX is to time commands that you regularly execute.
使用UNIX提高办公工作效率的另一种有价值的方式是，计算经常执行的命令所花费的时间。
As an example, the Atmosphere’s Broadcaster is very useful when it is time to push/aggregate/filter data between suspended connections.
例如，Atmosphere的Broadcaster在挂起的连接之间push/aggregate/filter数据时就非常有用。
But taking even short periods of time off is useful. Here's what I suggest you to do.
但是，一小段时间的休假也是有效的。
Storing a single profile item is useful, but most data changes over time, particularly when you talk about energy usage.
存储单个配置项目很有用，但大多数数据随时间改变，特别是当您谈论能源用途时。
This is useful when editing and visualizing the structure of the information all at one time.
当您在编辑并同时查看信息的结构时，这一点就十分有用了。
Obviously, the sooner you detect that something is wrong, the more time and opportunity you have to collect useful diagnostic information for troubleshooting.
很显然，您越早检测到出错的地方，您将有越多的时间和机会来收集有价值的诊断信息，并将其用于故障诊断。
It is also useful in smaller applications to provide improved throughput and response time.
对于较小的应用程序也很有用，它能提高吞吐量和响应时间。
It also allows control over the maximum amount of CPU time available to a particular job, which is quite useful for an administrator.
它还可以控制某个作业可以使用的CPU时间的最大值，这对于系统管理员来说非常有用。
This is very useful if you don't have time to launch your e-mail application to see the contents of a last-minute message.
如果您没有时间启动电子邮件应用程序来查看一封紧急消息的内容，那么这个选项很有用。
The concept of a container is critical at design time and is useful in other situations as well.
容器的概念在设计时很关键，并且在其他情况下也很有用。
This is another productivity helper and can reduce the time needed to develop a message flow, which can be useful in large projects where code reuse is usually greater than in small projects.
这是提高工作效率的另一种方法，并可以减少开发消息流所需的时间，对于较大的项目来说，代码重用比小型项目更为常见，所以这种方法非常有用。
As described earlier, a single pass of either the host or port scanning information is only useful for the instant in time when the scan was executed.
如前所述，如果只进行一次扫描，那么主机或者端口扫描信息仅在执行该次扫描的时候是有用的。
The two may differ because you can change how many matches are returned each time and which batch of matches to return, which is useful for paginating long lists of results.
这两者可能不同，因为您可以更改每次返回多少个匹配结果以及要返回哪批匹配结果，哪个结果利于对冗长的结果列表分页。
Using programmatic emulation is useful if you are tired of entering values or even picking values from the data pool every time a component is emulated.
如果在每次模拟组件时厌倦了输入值，或者甚至厌倦了从数据池选取数据，则使用编程式模拟非常有用。
All that money the candidates have been splashing out is useful at a time when Indonesia's economy is cooling sharply in the draught from the global downturn.
在一印尼经济在全球经济减速的大背景下正急速降温的时刻，候选人们花费的金钱对帮助经济很有用。
There is a period of time when your install image is not consistent and any snapshot taken during that time will not be useful to you in your disaster data center.
有一段时间安装映像会存在不一致，在此期间捕获的任何快照都不能在灾难数据中心中使用。
There is a period of time when your install image is not consistent and any snapshot taken during that time will not be useful to you in your disaster data center.
有一段时间安装映像会存在不一致，在此期间捕获的任何快照都不能在灾难数据中心中使用。
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