The worst of it is that I can't even be sure if they received my letter.

最糟糕的是，我甚至不能确定他们是否收到了我的信。

《牛津词典》

A lot of people think that it's better to pay for their education so that they can be sure of getting quality.

很多人认为最好是自己掏钱受教育，为的是能肯定得到高品质的教育。

《柯林斯英汉双解大词典》

I'm sure they'd dance and sing and flute and that would be the wafts of music.

我相信它们会跳舞、唱歌、吹笛子，那将是美妙的音乐。

youdao

They want to be sure that he is not dealing off the bottom of the stack of cards.

VOA: special.2009.11.22

So, it's perfectly okay to be part of a collaboration, but you've got to make sure that you're pulling your weight.

所以,参与小组讨论是完全允许的,但你要保证你在其中有所作为

耶鲁公开课 - 基础物理课程节选

One thing I forgot is if any of you has a cellphone be sure put that number down.

我忘了一件事，如果你们谁有手机,记得把手机号码写下来。

麻省理工公开课 - 电影哲学课程节选

That way, you can be sure that none of the pots, pans or utensils touched a problematic food in the preparation of the meal.

CNN: Making Valentine's Day safe for your allergic sweetie

We need to be sure that any of the currently proposed structural changes will actually have the desired effect of strengthening the potential of our small businesses.

FORBES: My Excellent Day on Capitol Hill

And while people with concerns over privacy will not install Facebook Home, you can be sure that hundreds of thousands of people being told that their phone can be a better with Facebook Home will rush for the download.

FORBES: Facebook Ready To Spend Heavily To Promote A Successful Facebook Home Launch