They actually make sure that certain streets get ploughed and other streets do not get ploughed when there is a snowstorm.

VOA: special.2011.04.25

I'm not certain it's meaningful, unless you are in the habit of giving your furniture personal names.

我不确定它有意义，除非你们热衷于,给你们的家具起名字。

麻省理工公开课 - 计算机科学及编程导论课程节选

Either that you are certain of something, that you are not certain of something,

一种是表达你对某件事情很有把握或者并没有什么把握，

I'm sure 课堂 - SpeakingMax英语口语达人

Using nets that let smaller fish escape and agreeing not to fish in certain areas can help reduce overfishing.

VOA: special.2009.08.11

If you're stuck, if you're struggling, if you're not certain about something, please ask. We're not mind readers, we can't tell when you're struggling, other than sort of seeing the expression on your face, we need your help in identifying that.

如果你很差，如果你很纠结，如果你不确定某件事情，请问我们，我们不会读心术，我们没法儿看出来你们很纠结，除非能从你们的面部表情看出来，我们需要你们在这件事儿上的配合。

麻省理工公开课 - 计算机科学及编程导论课程节选

In nineteen seventeen, Cornell University scientist Lewis Knudsen found that under certain conditions, the fungus was not needed.

VOA: special.2010.04.06

and you're not certain that your English sentences are being understood.

你不能肯定你说的英语对方有没有听懂。

I wonder if 课堂 - SpeakingMax英语口语达人

Also,he says reforms are needed so disabled people do not lose certain health assistance by taking a job.

VOA: special.2009.08.15

A state of war can include, in other words, " what we might call a "cold war," two hostile sides looking at each other across a barrier of some type, not clear or not certain what the other will do.

换句话说，战争状态包括，我们所说的“冷战“,敌对双方透过某种屏障,对对方虎视眈眈，却不知道对方会干什么。

耶鲁公开课 - 政治哲学导论课程节选

They include using nets that let smaller fish escape and agreeing not to fish in certain areas.

VOA: special.2009.09.08

And you're not certain what's best.

你不清楚怎么做最好。

What kind of 课堂 - SpeakingMax英语口语达人

"We will not only defend ourselves to the uttermost but will make it very certain that this form of treachery shall never again endanger us ...

VOA: special.2011.06.02

Then again, if you are not certain of something you can say "I'm not sure."

同样的，如果你对于一件事没有把握，你可以说“I'm not sure.”

I'm sure 课堂 - SpeakingMax英语口语达人

"Whereas the oil industry may find it business as usual to have a certain number of spills, it is really not acceptable, especially in this day and age.

VOA: special.2011.07.08

Now this may suggest a certain condescension both toward theory and toward literary text, which is not at all intended.

选择这篇文章也许意味着,要对理论和文本进行一定的浓缩，这一点不是我想要的。

耶鲁公开课 - 文学理论导论课程节选

"When I was reared in the British West Indies my grandmother used to always tell me, you may not be loved by certain forces in a society and you have to understand why.

VOA: special.2011.03.20

So the writer seems very determined to tell the story in a way that depicts God as acting not capriciously but according to certain clear standards of justice.

作者似乎决定,描述不是一个变幻莫测,而是有着很清楚公正原则的上帝。

耶鲁公开课 - 旧约导论课程节选

Victory was not yet certain.

VOA: special.2010.05.31

But in certain parts of the country you're not able to eat Trans fats in restaurants because they've been banned.

但在美国的某些地区,你不可能在餐厅吃到反式脂肪的,因为它们被禁售了

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

But we are not going to know for certain which approach makes sense until additional data is in."

VOA: standard.2010.07.16

So, we see that the two h atoms separate have a certain energy that's lower than when the electron's not with the atom.

那么，我们看到两个分开的氢原子所具有的能量,比原子中没有电子时更低。

麻省理工公开课 - 化学原理课程节选

Because certain things that government should provide to enhance those people doing the job are not there."

VOA: standard.2009.07.30

Because it challenged the whole class system, that people are born into a certain place and cannot-- and should not-- be moved.

因为它挑战了整个阶级体系，人生来就有阶级，不能-,也不应该被改变。

哈佛公开课 - 幸福课课程节选

But,they say they will not let the president off the hook until a number of important questions are answered and certain reprehensible acts are ended.

VOA: standard.2009.03.21

We can often better understand the dialogues by seeing Socrates as putting forward certain positions that he does not think are altogether adequate.

通过了解那些由苏格拉底提出,但他自己也觉得不充分的观点,我们可以更好地理解这些对话作品

耶鲁公开课 - 死亡课程节选

Hashibe says it is not clear how coffee might protect drinkers from certain cancers.

VOA: standard.2010.06.30

These are private companies--insurance companies--they're monoline because they look only at a certain class of risks and not all risks that they insure.

他们是私人保险公司,从事单线业务,因为他们只关注一类特定风险,而不是担保所有的风险

耶鲁公开课 - 金融市场课程节选

They are not allowed to smoke within a certain distance of those buildings.

VOA: standard.2010.02.18

I mean one way to describe this in a non-technical, non-Freudian way is, there are certain things about ourselves we'd rather not know.

用并不专业的非精神分析的话语来表述，就是我们并不想知道某些事情的存在。

耶鲁公开课 - 心理学导论课程节选

The lapse makes a certain kind of sense, I think, because it's virginity and not married chastity that the Lady imagines will allow her to demonstrate such a remarkable show of rhetorical strength.

我认为这一疏忽是有一定意义的，因为是女士想象的童贞,而并非婚姻贞节使得她,展现出如此强大的话语权。

耶鲁公开课 - 弥尔顿课程节选