"Even when they do perform a download, it's usually not that useful," says April Yergin, a Houston-based accident-reconstruction expert.
“即使他们下载了，通常也没什么用处，”爱普瑞尔·耶金说，他是休斯顿的事故重建问题专家。
If you do perform unit tests, you already know what a difference it makes: fewer bugs, better-designed software, and fewer surprises when you make a change.
如果你进行了单元测试，你已经知道它会产生什么不同：更少的bug、更好的软件设计、以及在你进行修改时更少出现奇怪现象。
Although these buttons are useless to the average person, they do perform their proper function for fire fighters and maintenance workers but only with a code or designated keys.
尽管这些按键对普通人而言没有作用，但对于使用密码或特定钥匙的消防员或维修人员来说，这些按键能够很好地发挥其作用。
Studies from the United States and Australia show that students who take a gap year are generally better prepared for and perform better in college than those who do not.
美国和澳大利亚的研究表明，经历过间隔年的学生通常比未经历过间隔年的学生对大学生活有更充分的准备，在校的表现也更好。
The research argued that boys often perform badly in mixed schools because they become discouraged when their female peers do better earlier in speaking and reading skills.
研究认为，男孩通常在男女混合学校的表现不好，因为当其女性同龄人比他们更快地在口语和阅读技能上做得更好时，他们会灰心。
She can perform Chinese kung fu a little now, but she couldn't do it last year.
她去年还不会中国功夫，但现在会一点了。
When I look at this test script, I see something that I know I will want to be able to do in many other scripts - perform a search (Figure 1).
在我查看这段测试脚本时，我看到了某些我想要能够在许多其它脚本——执行一个搜索(图1)——中做的东西。
Do participants perform well enough to meet the usability objectives?
测试参与者的表现是否满足可用性目标？
The activities can call other services, perform computations, or do just about any kind of programming work.
这些活动可以调用其他服务、执行计算或执行任何种类的编程工作。
You do this by letting the agent perform a server-side redirect to your XML view as shown in the next line of code.
这是在代码的下一行中完成的，即让代理执行到您的xml视图的服务器端重定向操作。
We could do it by having seven fields that each perform the lookup.
为此，我们可通过使用七个字段（每个字段都执行查找）来实现。
What will happen, if you truly implement this cycle, is that everything you will perform in Do will become smooth and with a touch of flow.
如果你切实地执行这么一个循环，会有什么发生？所有的一切你都会顺理成章地完成。
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.
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。
So, for this example, we'll assume that the operations that our NHRTs need to perform do create some objects and use some memory each time they are performed.
因此，对于本例，我们将假设NHRT需要执行的操作会创建一些对象，并在每次执行时占用一些内存。
It's worth noting that you do not perform the distinct function on a cursor or result set as you do other query functions, but you perform it directly on the collection.
值得注意的是，您在执行其他查询函数时不能在指针和结果集上执行distinct函数，而应直接在集合上执行。
Although different access paths for the same SQL statement produce the same result set, they most likely do not perform the task with the same level of performance.
虽然相同sql语句的不同访问路径会产生相同的结果集，但是它们很有可能不会通过同样的性能级别来执行任务。
What you should not do is use these techniques to perform a security test without permission.
您不应该在没有获得批准的情况下使用这些方法来进行安全测试。
The JVM verifies all classes in class loaders and ensures that applications do not perform any dangerous operations.
JVM验证类装入器中所有的类并确保应用程序不会执行任何危险操作。
This principle addresses many questions, including: How do you motivate people to perform at their best?
这一原则指出了很多问题，包括：你如何激励人们，使他们的表现最好？
However, in most cases, you do not need to perform query tuning manually.
尽管如此，大多数情况下，您不需要手工执行查询调优。
And at the top of the hierarchy, the executive leaders who set goals and oversee the program certainly do not perform the same detailed activities as project managers.
并且在这个层级的顶端，设定目标和监督规划的主管经理当然不会执行与项目经理同样详细的活动。
When a unit is added to archive and is already controlled by configuration management, do not perform the add-to-archive operation.
当一个单元添加致档案中，或者已经由配置管理控制时，不要执行添加至档案的操作。
This enables DBAs to do everything to the database that they would ordinarily do-perform regular administration tasks, load data, use utilities-but not see or alter the data.
这让 DBA 能够对数据库执行他们原来所做的所有操作（执行日常管理任务、装载数据、使用实用程序等等），但是不会看到或修改数据。
When supporters perform a service, they do not keep the money they are paid, but have the amount, minus expenses, sent directly to their group.
当赞助者们提供了一个服务，他们并不保留获得的薪水，而是将总收入检出支出，剩下部分直接交给团队。
In the meantime, you'd do well to perform some simple tests using your own favorite API, to see how it (ideally) preserves semantic equivalence.
同时，您也可以使用喜欢的API作一些简单的测试，看看它是否(理想地)保持了语义等价性。
It has nothing to do with your psychological condition at that moment.You still take the exam as you used to and your mood does not change at all, but you do not perform well.
你还是和以前一样地考试，你的心态并没有大起大落，但是最后你就是考差了，于是大家都在想你的心态是不是不够沉稳。
You still take the exam as you used to and your mood does not change at all, but you do not perform well. Then everyone is pondering whether your psychology is not stable enough.
你还是和以前一样地考试，你的心态并没有大起大落，但是最后你就是考差了，于是大家都在想你的心态是不是不够沉稳。
You still take the exam as you used to and your mood does not change at all, but you do not perform well. Then everyone is pondering whether your psychology is not stable enough.
你还是和以前一样地考试，你的心态并没有大起大落，但是最后你就是考差了，于是大家都在想你的心态是不是不够沉稳。
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