How do you determine policy when you don't have the hard scientific facts and when a public health threat is probable but not certain?
如果不掌握确凿的科学事实，而公共卫生威胁很可能发生但并不确定，则如何来决定政策？
He philosophized, he admitted, not because he was certain of establishing the truth, but because it gave him pleasure.
他承认自己反复推究不是因为他确定找到了真理，而是因为那给了他很多乐趣。
Scientists say both studies demonstrate that certain parts of the ecosystem respond rapidly to reductions in atmospheric pollution, but that these findings should not be used as a license to pollute.
科学家称这两项研究都表明，生态系统的某些部分对于大气污染的减少反应迅速，但这些发现不应该成为允许污染的理由。
If you've always been a certain way or done a certain thing, but it's not working for you any more, or you're not content, Emerson says that it'd be foolish to be consistent even with our own past.
如果你总是以某种方式或做某种事情，但它不再适合你，或者你不满足，爱默生说，即使是与我们自己的过去保持一致也是愚蠢的。
Not only do tears keep your eyes lubricated, but they also contain a substance that kills certain bacteria so they can't infect your eyes.
眼泪不仅能使你的眼睛保持湿润，它们还含有一种物质，可以杀死某些细菌，使它们不会感染你的眼睛。
The seed suppliers tell me things will be better next year, but I am not certain I trust them.
种子供应商告诉我明年情况会更好，但我不确定是否能相信他们。
Spices not only dramatically improved the taste of the European diet, but also were used to manufacture perfumes and certain medicines.
香料不仅极大地改善了欧洲饮食的口味，而且还被用于制造香水和某些药物。
At certain times but not at others, for example, they are capable of passing the eyeblink test.
例如， 只在一定时间而在其他时间不出现的对眨眼反射作出的反映。
Not to complicate things, but for certain workloads, we've actually seen an increase in performance as well with a uniform page size since memory doesn't get fragmented.
为了不将事情弄复杂，而是针对某种工作负载，我们已真正看到了通过统一页面大小带来的性能增长，因为没有将内存分成几段。
First, you could more easily adopt a subset of it if you found value in certain modules but not others.
第一，如果我们发现某些模块存在价值，而其他模块没什么价值，则可以更方便地采用它的一个子集。
Doctors do agree on limiting a quantity of food, but they also insist on certain foods (but not on the total banishment of them) and a balanced diet.
医生当然同意限制进食食的量，但是他们也只是针对某些食物（但也不是完全不食）和建议均衡饮食。
Often, a request requires an instance of a certain class, but this object does not (and should not) need to be recreated in every request.
每个请求都需要特定类的实例，但此对象并不(也不应)需要在每个请求中重新创建。
There is no reason to expect they would not compose nicely, but until testing is actually done, it is not certain.
没有理由预测它们不能够很好地组合，但是在实际执行测试之前，仍然是不确定的。
It can get complicated, but we have decided to not allow certain kinds of content in the App Store... we will reject Apps for any content or behavior that we believe is over the line.
它可以很复杂，但是我们决定不允许某些类型的内容在苹果商店中出现……我们将拒绝任何包含越界内容或行为的应用程序。
This is academically very interesting and it has a certain aesthetic appeal, but it's not particularly useful.
在理论上这是非常有趣的，而且具有一定的艺术性，但是它并不特别实用。
Another example is when the original file is very large, and was printed earlier, but certain pages did not print correctly because the printer jammed or had some other problem.
另一个示例是，原始文件很大而且以前已打印过，但某些页面由于打印机卡住或其它原因而没有被正确打印。
The type case is not important in general, but certain implementations specify a particular case for the combination of language code and country code.
字号一般不重要，但某些标准中在语言代码和国家代码组合中也规定了字号。
The uncertainty of this radius is, of course, not very large but we are not certain about the radius to about one centimeter, so it's 85 plus or minus one centimeters.
半径的不确定性是，当然不是很大,但是我们不能把半径,确定到1厘米范围内，因此是85加减,1厘米。
So, having dispensed with Nicander’s imaginative tale, here’s the more likely chain of events, still not completely certain but strong enough to rate inclusion in most dictionaries.
然而，和Nicander的想象力不相上下的事情，这里却有一连串，是否完全属实还不确定但却已经足够让众多词典收录在册了。
He was a man of integrity, but unfortunately he had a certain reputation, I believe the reputation was not deserved.
他是一个正直的人，但不幸的是他有某种坏名声。我认为这种名声是不应该有的。
CM provides some tools to manage users and user groups, but in certain cases, these tool are not sufficient.
CM提供了一些工具来管理用户和用户组，但是在某些情况下，这些工具还不够。
Not only can you look around, but at certain points, your actions determine where you go next, and the whole thing is riddled with surprises.
你不但可以看看四周，而且在某些时候，你的行动决定下一步要做什么，整个过程充满了惊奇。
There have also been a few dozen cases of liver damage reported among people using green tea extracts, but it's not certain that the supplements are to blame.
在那些使用绿茶提取物的人群中，也报道了一些很少的对肝脏有损害的案例，但是这是不是这些补充剂的所为还尚待明确。
This equation is of some value for describing particles without spin-certain kinds of mesons-but does not apply at all to the electron.
这个方程在描述没有自旋的粒子——比如某些介子——具有一定价值，但它对电子完全不适用。
We now know tomatoes not only reduce the risk of certain cancers, but can improve your vision, skin, and brain.
现在我们知道，西红柿不仅能降低罹患一些癌症的危险，还能改善视力，养颜美肤和避免大脑老化。
Network providers do not guarantee a certain quality of service, but merely promise to do their best. That may not matter for personal e-mails, but it does for time-sensitive data such as video.
网络提供者们不担保某种程度的服务质量，仅承诺将尽力而为，这可能对个人电邮不算什么，但是对时间敏感的数据比如视频就很重要了。
A clever man may not be wise, but a wise man must be of a certain degree of cleverness.
聪明的人不一定代表着智慧，智慧的人却代表着一定程度上的聪明。
A clever man may not be wise, but a wise man must be of a certain degree of cleverness.
聪明的人不一定代表着智慧，智慧的人却代表着一定程度上的聪明。
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