One's resolve is unshaken.;swear [vow] to adhere to one's chosen course;take an oath not to change one's mind ;

You need perseverance to win in politics and I doubt if he can go the distance.
在政治上,需要矢志不移才能取胜,我怀疑他能否坚持到底.
来源:互联网摘选He displayed determination as well as powerful oratory.
他既展示出震撼人心的雄辩术,又显露了矢志不移的决心。
来源:《柯林斯高阶英汉双解学习词典》简答网 · 雅思托福

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