因為當佢哋撰寫 《 美國憲法 》 嘅時候 佢哋曾經喺大堂外嘅石卵 鋪滿泥土嚟減低噪音 等佢哋可以專心寫
Because when they were writing the Constitution of the United States, they used to lay dirt on the pebbles outside the lobby to reduce noise and allow them to concentrate on writing