I think Michelle is right, because "campo de futbol" is the field where " juegan los futbolistas" (the football players play), and the "estadio" is the "campo" and the building whole.
2014年12月22日
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In fact, there is no difference in the informal language.
But 'campo de fútbol' is where there is lawn. 'Estadio de fútbol' is the general environment. The total area.