泄劲的英文：
feel discouraged; lose heart

参考例句：

She felt disheartened at her failure
她因失败而泄劲。

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。

discouraged是什么意思：
v.[T]
1.使泄气，使沮丧
2.阻拦，劝阻

It is a discouragement to me.
这真使我泄气了。

They discourage further diffusion.
它们阻碍进一步扩散。

Father discourage the expression of enthusiasm.
父亲不准有热情的表示。

lose是什么意思：
v. 遗失；输掉；浪费；被...夺去；不明白；逃避；错过

to lose; to miss; to disappear; to mislay
遗失

A tale never loses in the telling.
故事总是被人们说得添枝加叶的。

Merry is he that has nought to lose
人无所失,不亦乐乎