be sure about

基本解释

However, you need to be sure about no reuse.
但是，需要確保沒有重用。
That is scary, and we cannot be sure about changes in the future.
這是可怕的，因爲我們無法確定未來會發生什麽變化。
There were many I didn't know, and others I couldn't be sure about because they were so covered in green parasites.
這裡有許多我不認識的樹，還有有一些樹我沒法確認，因爲它們都覆蓋在了密密麻麻的綠色藤蔓植物下。

But Professor Bedau says that nobody can be sure about the results of making new forms of life.
I'm not at all sure there's anything more to be said about that passage, which I think lays it to rest.
我不確定這篇文章是不是,還要更多的講解，就這樣的吧。
耶魯公開課 - 文學理論導論課程節選
Weird things, bad things can happen and so one of the lessons too that will be repeated throughout the course is to actually rigorously error check and make sure that you're always thinking about your user being a bad guy.
各種古怪的事情就會蜂擁而至,所以在這個課程中我反複強調,要一絲不苟地檢查錯誤,你就儅你的用戶是個調皮擣蛋的家夥。
哈彿公開課 - 計算機科學課程節選

How can voters be sure about what Republicans really believe, other than the importance of winning elections?
FORBES: Republicans Need To Grow Up About Taxes