干劲的英文：
enthusiasm

the city's indomitable optimism and can - do spirit(Christian Science Monitor)
这座城市坚不可摧的乐观主义和充满干劲的精神(基督教科学箴言报)

the city's indomitable optimism and can - do spirit(bChristian Science Monitor)
这座城市坚不可摧的乐观主义和充满干劲的精神(b基督教科学箴言报)

an aggressive salesman
干劲很大的售货员

He has a lot of muscle and mustard.
他力气大干劲足。

Person who is successful by being energetic and ambitious
有干劲和雄心的成功者

Why is staying in touch with you not including a motivation to do it?
为什么与你接触无法提高我做事的干劲？

No one can match up to Comrade Wang in efficiency and vigour.
有效率和干劲方面没有人比得上王同志。

Bobby can always find something to do if he has a little git - up.
只要鲍比有干劲便经常能够找到事情做。

You need to put more zing into your playing.
你在这一活动中需要再增加些干劲.

A person's vigour is the energy used,especially in work
vigour用于人时,指所用的体力、精力,尤指工作活力或干劲

He was ablaze with enthusiasm.
他热情洋溢。

Nothing is so contagious as enthusiasm.
热情是最富有感染力的。

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

Enthusiasm is very catching.
热情非常富有感染力。

His enthusiasm was in no way flagging.
他的热情丝毫未减。