有生力量

Explanation: ① originally referred to the army troops and horses. Also refers to a fighting force. ② refers to the dynamic power. 　　Source: Mao Zedong's "concentration of superior force to destroy the enemy," the principle of concentration of troops each to annihilate the enemy, to annihilate the enemy's effective strength our main objective, or seizing a place not as the main target. " 　　Examples: Youth has always been tightly integrated commando social production, has maintained a vibrant, content-rich activities to promote the production into a ~. ★ "The Socialist Upsurge in China's rural areas"