These words all describe people who are good at learning, understanding and thinking about things, and the actions that show this ability.以上各词均形容人有才智、悟性强、聪明。
intelligentgood at learning, understanding and thinking in a logical way about things; showing this ability指有才智的、悟性强的、聪明的：◆He's a highly intelligent man.他是一个很有才智的人。◆She asked a lot of intelligent questions.她问了许多机智的问题。
smart(especiallyNAmE) quick at learning and understanding things; showing the ability to make good business or personal decisions指聪明的、机敏的、精明的：◆She's smarter than her brother.她比她哥哥聪明。◆That was a smart career move.那是个人事业发展上的明智之举。
clever(sometimesdisapproving, especiallyBrE) quick at learning and understanding things; showing this ability指聪明的、聪颖的：◆How clever of you to work it out!你解决了这个问题真是太聪明了。◆He's too clever by half, if you ask me.恕我直言，他未免聪明过头了。NOTEPeople use clever in the phrase Clever boy/girl! to tell a young child that they have learnt or done sth well. When used to or about an adult clever can be disapproving. * clever 用于短语 Clever boy/girl!（多么聪颖的男孩/女孩！）表示孩子学习悟性强、做事聪明伶俐。clever 用于成年人可能含贬义。
brilliantextremely intelligent or skilful指聪颖的、技艺高的：◆He's a brilliant young scientist.他是一个才华横溢的青年科学家。
brightintelligent; quick to learn指聪明的、悟性强的：◆She's probably the brightest student in the class.她大概是班里最聪明的学生。NOTEBright is used especially to talk about young people. Common collocations of bright include girl, boy, kid, student, pupil. * bright 主要用于年轻人，常与之搭配的词有 girl、boy、kid、student、pupil 等。