premise: Cheerleaders are on the field cheering. hypothesis: The Dallas Cowboys' cheerleaders are trying to pump-up the crowd.
neutral: It is impossible to infer that the cheerleaders are specifically Dallas Cowboys' cheerleaders without this extra information added, since there are many different sports teams that have cheerleaders. Cheerleaders could be cheering at a practice, not specifically at a game, so "pump-up the crowd" gives more context, such as there being a large crowd and the setting being a game, that is not otherwise included.