你必须坚强和自信，决不要给人留下丝毫应付不了此事的印象。

You have to be strong and confident, and never give the slightest impression that you can't hack it.

《柯林斯英汉双解大词典》

六个月后，约翰已经能够识字和算数了，也有了自信。

Six months later John had developed literacy and numeracy skills, plus confidence.

《柯林斯英汉双解大词典》

和自信的人在一起。

Be around confident people.

youdao

This coda suggests something like a victory over all of those worries of unpreparedness as the worried rhetoric of "not yet there" gives way to a much more confident language of present completion, the "now."

这个终结暗示着,对所有的尚未准备好的忧虑的完全克服,一种对现在已经完成的事业的,自信和满足“

耶鲁公开课 - 弥尔顿课程节选

But they--because of over confidence and magical thinking, it starts to go to their ego.

但由于过度自信和神奇式思考,他们会自我膨胀

耶鲁公开课 - 金融市场课程节选

There's a kind of colloquial clarity and confidence, quite different from the vernacular language in the Hardy poems I was just reading, which are also poems of the countryside.

有一种口语式的清晰和自信，与哈迪诗中的地方语言十分不同,我也在阅读关于乡村的诗歌。

耶鲁公开课 - 现代诗歌课程节选