hints：
Nation
Liberty
Fourscore and seven years ago, our fathers brought forth upon this continent a new Nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.
87年前，我們的先輩們在這個大陸上創(chuàng)立了一個新國家。它孕育于自由之中，奉行一切人生來平等的原則。