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How many calories in chinese food beef and broccoli?
Also - you can look on the site of the actual restaurant.
For example - panda express has their nutrition data online (they have a beef with broccoli listed there that you could use as a reference)
http://pandaexpress.com/menu/nutrition.aspx
A site called nutritiondata.com will show you how many calories and other nutrition data for most foods. I think you might have to go through a free registration, but it has a lot of handy info.