泄气的英文：
despair
feel like giving up

参考例句：

If this is not affirmed, people will be disheartened
不肯定这一点，就泄气。

To make discouraged;dispirit.
使…泄气;使…扫兴

Don't be discouraged.
不要泄气。

Don't be so despondent.
不要这样泄气.

lack of interest that disheartened the instructor
缺乏兴趣使教员很泄气

The bad news disheartened him.
坏消息使他很泄气。

She's easily disheartened by difficulties.
她遇到困难很容易泄气。

"Nay, be not discouraged
“不，不要泄气。

Don't be discouraged by setbacks.
别因挫折而泄气。

I was more disappointed than discouraged.
我是失望，而不是泄气。

despair是什么意思：
n. 绝望
v. 绝望

Action is the antidote to despair.
行动是绝望的解毒剂。

The doctors despaired of it from the start.
医生们从一开头就对它表示绝望。

Despair gives courage to a coward.
人急造反，狗急跳墙。

feel是什么意思：
v. 感觉；认为；有知觉；摸索
n. 感觉，印象

feeling of efficacy
效力感

Has a feeling for language.
对语言有领悟力

You can feel the electricity in the crowd.
你可感到群众的激情。

giving是什么意思：
v. [give] 的现在分词形式；给，交付，授予

Will you give it a shot?
你想做尝试吗？

He gives twice who gives quickly

The purpose is not to give an exhaustive treatment.
其目的并不是给出全面彻底的处理。