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1.first-ever 首次的
例句：Ireland has become the first-ever country to approve same-sex marriage by referendum.
爱尔兰成为第一个通过全民公投，使同性婚姻合法化的国家。
2.prototype n. 原型
例句：Metal-wheeled chariots are the prototype of the tanks of modern warfare.
金属轮战车是现代战争中坦克的原型。
