Perhaps the most important defining characteristic of a human being is culture. The term culture as used here is not limited to operas, paintings, and other artistic endeavors. These are seen by anthropologists (人类学家) as examples of culture: culture itself is the customary manner in which human groups learn to organize their behavior and thought in relation to their environment. Defined in this manner, culture has three principal aspects: behavioral, perceptual and material. The behavioral compo