"人际关系"用英语表达为 "interpersonal relationships"。
其中，"inter-" 是 "between" 的合成词，表示 "between" 或 "among" 的意思；"personal" 是 "individual" 的形容词形式，表示 "个人的" 或 "个体的" 的意思；"relationship" 是 "关系" 的意思。
所以 "interpersonal relationships" 的意思就是 "个人之间的关系"。
例句：
Effective communication is essential for building and maintaining healthy interpersonal relationships.
(有效沟通是建立和维护健康人际关系的关键。)
Interpersonal relationships can be challenging, but they are also very rewarding.
(人际关系可能具有挑战性，但它们也非常有益。)
Understanding and managing interpersonal relationships is an important part of personal and professional development.
(理解和管理人际关系是个人和职业发展的重要部分。)