Definition
to provide additional details or clarification about something previously mentioned or written
对…详细阐述；进一步解释
Could you expand on the details of this project?
你能详细说明这个项目的细节吗？
The teacher asked the students to expand on their arguments.
老师要求学生详细阐述他们的论点。
During the meeting, the manager asked him to expand on the benefits of the proposal.
在会议期间，经理要求他详细说明提案的好处。