内心笃定用英文怎么说呢

在英文中，内心笃定用英语可以用 "be resolutely determined in one's heart" 或 "have a resolute determination in one's heart" 来表达。

这个短语来源于拉丁文 "resolvere"，意思是"解决，做出决定"。"Resolute" 是形容词，意思是"坚定不移，坚决"。"Determination" 是名词，意思是"决心，毅力"。

下面是一些使用这个短语的例句及其中文翻译：

She had a resolute determination in her heart to succeed.
她内心笃定要成功。
Despite the challenges, he remained resolutely determined in his heart to achieve his goals.
尽管有挑战，他依然内心笃定要实现他的目标。
The team leader was resolutely determined in his heart to lead the team to victory.
队长内心笃定要带领团队取得胜利。