about是什么意思,about me什么意思

老外说"i'll think about it"并不是真的会考虑,别太天真了!
what's the song about?(这首歌是关于什么内容的?)
what do you want to know about your new english teacher?
what are they talking about? 他们在谈什么?
新标准英语第八册what's_it_about_它是关于什么的ppt