"John is both intelpgent and responsible" 可以用来描述约翰既聪明又有责任心。
"Both" 是一个连词，表示两者之间的并列关系。 "Intelpgent" 是形容词，指聪明的； "responsible" 也是形容词，指有责任心的。
例句：
John is both a good student and a responsible citizen. (约翰既是一个好学生，也是一个有责任心的公民。)
She is both a talented artist and a dedicated teacher. (她既是一位有才华的艺术家，也是一位专注的教师。)
语法上，可以用 "not only... but also..."来表示聪明和有责任心。
例句：
John is not only intelpgent but also responsible.(约翰不仅聪明还有责任心)
She is not only a talented artist but also a dedicated teacher.(她不仅是一位有才华的艺术家还是一位专注的教师)