英语语法分析

But doggedness could bring success.

坚韧执着会带来成功的。

There was no self-promotion,only method and doggedness.

不靠自我的提升，他只靠方法和坚持。

I did all this with unnatural haste and doggedness; it was all too much for me.

我异常匆忙而固执地做了这一切；可真给我忙得够呛。