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Ligdx Box2d : convert box2d coordinates into screen coordinates

I'm new in libgdx and i have a little problem. I created a body in box2d and i want to assign it a sprite; for that i need to get the position of the body,then insert into the main loop the updated ...
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Why set the position of both b2Body and Box2DSprite?

In a game, we add a body for each sprite, the method is: createBodyAtLocation:(CGPoint) forSprite:(Box2DSprite*)sprite In which we create the body and we attach it to the sprite in parameter: ...