You can work on the Chinese some more to fit your context. But "takeaway" basically means the important central point/s you take home with you.

http://www.the-aps.org/press/conference/ibe/7.htm

The takeaway message: exercise regularly because you never know when you’ll be exposed!

http://feeds.feedburner.com/RearrangingTheDeckChairs

Key takeaway message 1: IT project failures more often arise from business, rather than technical, issues and challenges. Read through the pages of this blog, and you’ll find numerous examples of poor planning, poor execution, and poor management. These are simply not technical problems.

Key takeaway message 2: Retain control of your own destiny. No matter how good the consultants, the locus of control on the project should always remain with you. If you aren’t clear on why the consultants recommend a particular strategy, then ask. The best consultants will welcome your questions, and carefully work through the issues with you.