请帮我翻译一句话…

翻译成这样
just one promise,which i shall fight hard for it,will last for the rest of my life

或者one promise ,i will do my best and guard it for the rest of my life

I will perfect my promise and protect it with all my life!
按意思翻译的…

你好，我想是
A promise, I will do well, I used the rest of his life guard

或者

A pledge, I will achieve complete, with mine remaining years of life protection.”

A promise, I will do well, I used the rest of his life guard

A commitment, which I will fulfill well enough with my rest of life.

比较合理的翻译：
A promise ，I will achieve it and do it well，and I’ll keep it during the rest of my life。