They are either very shy or over-confident.

他们或者非常羞涩，或者过于自信。

This is what comes of being over-confident.

这就是过于自信的结果。

We're not over-confident about its sales success but we are quietly confident.

对于它的销售成功我们不过分自信，但我们也已是相当有信心的了。

Don't Be Over Confident.  Do not go to the interview presuming that you got the job--an over confident attitude can be damaging.

不要自负。 面试时，不要觉得自己已经得到了这份工作，自负是很要命的。

Jefferson especially tried to warn Genet not to be over confident. But Genet would not listen.

杰弗逊特意试图警告吉奈特不要过于自信，但吉奈特听不进去。

Alisa: I often come off as somewhat over confident when I am performing on-stage…that's usually the nerves.

我经常在我表演的舞台上表现过于自信，其实我是很紧张的。

Do not be over-confident and careless. Your circumstances may change quickly and the emptiness of your bragging will be exposed.

别过分自信和粗心。你的境遇或许立刻改变，你的夸夸其谈马上就暴光了哦。

This also ties into the Dunning-Kruger effect, where one is over confident in their abilities, which unknowingly limits their intake of knowledge.

这也和达克效应相关，即一个人对自己的能力过于自信，这在不知不觉中限制了他们对知识的吸收。

Optimism can make you healthier, happier and extend your life. The Army teaches it in order to increase mental toughness in soldiers. Being over confident improves performance.

乐观让人健康，开心，长寿。军队为使士兵精神强大坚毅也教人乐观。过度自信让人表现更好。