必不得已

Explanation: Must not be ended. Means the situation is not so not so. That no alternative means. 　　Source: "Analects, XII": "Zigong asked about government. Confucius said: 'sufficient food, foot soldiers, the people believe the carry on.' Zigong said: 'will be forced away, in Sri Lanka where the first three?' Said: 'to soldiers '. " 　　Examples: Huai Wei cloth, leather its non-heart, ~, then the battle Dashun to discuss it, sending troops to sign it. ★ Tang Quan, "Hou unjust closure proposal ancestor"