全力拼博
In our civilized, modern life, we use our teeth foreating only, and our fingernails and toenails are usedhardly at all, except for decoration. Amonganimals, however, teeth and nails are often used tocollect food or catch prey. More aggressiveanimals, such as tigers and bears, use teeth andnails to attack other creatures or defend theirterritory. If attacked themselves, they will fiercely"fight tooth and nail" to avoid being wounded orcaptured.
在现代文明生活中，我们只用牙齿吃东西，但是手指和脚趾却鲜有派上用场的时候，除了用来装饰。然而动物则经常使用牙齿和指甲来采集食物或者追捕猎物。攻击性更强的动物，例如老虎和熊，则用牙齿和指甲攻击其它动物或者保卫自己的领土。如果自身被攻击，它们会拼命用牙齿咬，挥舞爪子，以避免受伤或者被俘。
From that animal origin, we have imported this idiom into our civilized, modern life to representany situation where we humans feel we must fight aggressively for some cause or purpose. Itdoes not mean to fight physically, as animals do, but to fight verbally using ideas andarguments.
从动物身上，我们将这一习惯用语引入到文明的现代化生活中，来表示我们人类为了某些原因或目的，去全力拼搏的情况。不一定是像动物一样来肉搏，而是指用各种想法和争论，从言语上力拼到底。
