刚柔相济

Explanation: Strong and soft swap with each other. 　　Usage: The main predicate; as the predicate attribute; that strong and gentle with each other 　　Source: HW Can "for the Jingzhou Liu and Yuan Shang": "When the CD is the meaning of service, only China is Hong. What are? Gold wood fire and water with hardness and softness, then g lent and, for civilian use." 　　Examples: Where is the person, as to ~, not only relies on their bravery. (Ming Luo, "Three Kingdoms" Seventy back)