“遵守诺言”常见的英文表达有 “keep one's promise” 或 “fulfill one's promise” 。
keep one's promise：强调持续、坚定地信守承诺，不违背。例如：He always keeps his promises, so we all trust him.（他总是遵守诺言，所以我们都信任他。 ）
fulfill one's promise：侧重于实际履行、实现承诺所包含的内容。例如：She fulfilled her promise to help the poor children.（她履行了帮助贫困儿童的诺言。 ）