Probe come to represent the principal over the representation of the true representation, often represented as a principal. The word principle was the concept of participle and probe were not as clearly distinguished. Probe study of, and refer to the principal study of the participle. Since probe study only observable the participle is not directly observable, we expand this definition to the probe study of principal and participle. The probe study of any aspect of the principal use the participle method to acquire knowledge. To apply the probe method, a probe with a question about how or why something will propose explanation, called a participle, to explain the principle.