She made a solemn promise to him when they became engaged that she would give up cigarettes for good.

他们订婚时，她向他许下郑重的承诺，说她会永远戒烟。

《柯林斯英汉双解大词典》

She made a solemn promise to him when they became engaged that she would give up cigarettes for good.

他们订婚时，她向他许下郑重的承诺，说她会永远戒烟。

《柯林斯英汉双解大词典》