They said they were not sure about his decision to withdraw from university studies to play poker.

VOA: special.2010.07.26

I'm sure there were bows and arrows at that time, but they did not yet have the kind of armor that they would have in this time.

我能肯定那个时候已经有弓箭,但强力的盔甲,那时肯定还没有出现

耶鲁公开课 - 古希腊历史简介课程节选

Plato's views on democracy were not all negative, to be sure.

并非都是负面的，这可以肯定。

耶鲁公开课 - 政治哲学导论课程节选

When the show first aired, some of its creators were not sure it would last one season.

VOA: special.2009.11.27

They didn't say God because, of course, the Enlightenment thinkers were not so sure they believed in God, but they still seemed to believe in something they wanted to call a creator.

他们没有说是上帝,因为,当然,启蒙思想家们并不确定他们,是信仰上帝的,但是他们似乎仍旧,信仰所谓的造物主

耶鲁公开课 - 古希腊历史简介课程节选

According to Mexican authorities the second victim was also in a white sport utility vehicle and since the gunmen were not sure which one was Redelf's car, they decided to kill the occupants of both vehicles.

VOA: standard.2010.04.01

So I took it as my role not to keep decisions away from him, but if they were important enough, to make sure that he had, he, the president, not a compromise, he the president had the oppotunity to make decisions among his cabinet officers, and he did.

所以我的作用是,让决定权掌握在他手上，如果事情非常重要，确保布什总统，不是那个折中意见，是总统,有机会在内阁官员的意见中,作自己的决定，他也是这么做的。

普林斯顿公开课 - 国际座谈会课程节选

He had a plan,he said. And he would not move until he was sure his men were ready.

VOA: special.2009.09.17

Even those who liked his books were not always sure what he was trying to say.

VOA: special.2010.01.10

she said. "But I still was not sure that people were speaking English."

VOA: special.2010.07.25

I wanted to be sure you were not like your father.

VOA: special.2010.06.26

Sure. Why not? A few of us were leaving.You could take their place.

VOA: standard.other

I'm not sure if that's the right word, but they were surprised nonetheless."

VOA: standard.2010.01.31

"In order to verify the casualties of civilians we have launched an investigation into this case to make sure how many civilians are killed and to make sure that what these civilians were doing at 2:30 in the morning in that place that is not a residential place.

VOA: standard.2009.09.04