"清醒且坚定"可以用英文表达为 "clear-headed and resolute"。
关于这个表达的来源，"clear-headed" 指的是思路清晰，有判断力的意思，这个词源于中世纪拉丁文 "clarus"，意思是明白的，清晰的。"Resolute" 指的是坚定的意志，有决心的意思，这个词源于拉丁文 "resolutus"，意思是坚定的，决心的。
下面是一些使用 "clear-headed and resolute" 的英文例句，并附上中文翻译：
She remained clear-headed and resolute throughout the crisis. (她在危机中保持清醒且坚定。)
He was able to make the tough decision because he was clear-headed and resolute. (他之所以能做出艰难的决定，是因为他清醒且坚定。)
In the face of adversity, she remained clear-headed and resolute. (在逆境面前，她依然清醒且坚定。)
关于这个表达的来源，"clear-headed" 指的是思路清晰，有判断力的意思，这个词源于中世纪拉丁文 "clarus"，意思是明白的，清晰的。"Resolute" 指的是坚定的意志，有决心的意思，这个词源于拉丁文 "resolutus"，意思是坚定的，决心的。
下面是一些使用 "clear-headed and resolute" 的英文例句，并附上中文翻译：
She remained clear-headed and resolute throughout the crisis. (她在危机中保持清醒且坚定。)
He was able to make the tough decision because he was clear-headed and resolute. (他之所以能做出艰难的决定，是因为他清醒且坚定。)
In the face of adversity, she remained clear-headed and resolute. (在逆境面前，她依然清醒且坚定。)