1)on ,about 关于
on 表示这本书,这篇文章或演说是严肃的,或学术性的,可供专门研究这一问题的人阅读;
about表示内容较为普通,不那么正式.
There will be a lecture on economics this afternoon.
He is writing a book on cooking.
He told me a lot about his life in the summer vocation.
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