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。
I accept his theories, but not without certain qualifications.
我接受他的理论，但并非毫无保留。
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。
Of course, there are certain limits but these are not age limits.
当然，会有一些限制，但不是年龄的限制。
But she's got a problem: she's not absolutely certain it's an original.
但她有个问题：她不确定这是不是真品。
Now this can be a great thing in certain circumstances, but not all the time.
现在，在某些情况下鲁莽还不错，但并不是每时每刻都行。
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。
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。
Lighten up: Certain topics, issues and events are serious but not everything is! Lighten up.
点睛：某些话题，观点和事情是很重要但却不是唯一。
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。
The tattoo will have a certain degree of pain but pain is not imagined!
纹身会有一定程度的疼痛，但没有想象的那么痛的！
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。
Not just any promotion, but that certain level in the corporate ladder where everything will be better.
不仅仅是任何晋升的机会，你可能仅仅想在公司的“阶梯”中处于某种高度，可能一切就会好起来。
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。
A certain degree of speculation should not only be allowed but also necessary.
一定程度的房地产投机不但应该允许，而且是必要的。
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。
It is not true security, but it can be useful in certain contexts.
这并不是真正的安全，但该方法在某些情况下很有用。
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。
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。
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