常见例句"If everyone in the United States were balanced on a map, a trucker crossing Steelville's Main Street would once have straddled the center of gravity. 如果美国的每个人都能在地图上保持平衡的话，那么这个正在穿越斯蒂尔维尔大街的卡车司机一度跨立在地心引力的中心。 返回 Steelville