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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _evaluate_dimension_fields(self) -> bool: """ Evaluates the dimension fields. Returns False if any of the fields could not be evaluated. """

        for _, item in self._dimension_fields.items():
            item.run_evaluate()
            if item.eval_error:
                return False
        return True