She seems very sure of herself.

她好像十分自信。

《牛津词典》

In general, these "short sleeps" appeared ambitious, active, energetic, cheerful, conformis in their opinions, and very sure about their career choices.

总的来说，这些“短睡眠”的人表现出雄心勃勃、积极向上、精力充沛、性格开朗，对自己的职业选择非常自信。

youdao

You don't sound very sure.

听你这口气，你自己也不大肯定。

《牛津词典》

We need to do a much better job of making sure that what's in those vending machines is very consistent.

VOA: special.2010.03.17

But remember that you do have recitation on Tuesday, so that could be very helpful with the problem-set, so be sure to go to recitation on Tuesday, and have a great long weekend.

记住，周二有习题课，这对做课后题很有帮助，所以周二一定要来上习题课，周末愉快！

麻省理工公开课 - 化学原理课程节选

to make sure that you speak with someone who is very knowledgeable about the prices of certain things.

一定要跟某些很了解价格行情的人谈谈。

关于购买艺术品 - SpeakingMax英语口语达人

"I'm very sure, in my own mind, that she was mentally and verbally abused, " he said.

CNN: Arias trial jury foreman calls decision 'gut-wrenching'

He maintained that the government is "very sure" that chemical weapons in Syria were brought there from Turkey.

CNN: SHARE THIS

She had overcome extreme shyness and had become very sure of herself without ever losing her human touch.

CNN: Henry Kissinger