Long-ago builders could have attached wooden poles to the stones and rolled them across the sand.
很久以前，建筑工人可以在石头上绑上木杆，然后让它们在沙子上滚动。
2
Along the east coast of the United States, the southernmost advance of this ice is recorded by the enormous sand and drift deposits of the terminal moraines that form Long Island and Cape Cod.
沿着美国东海岸，最南边的冰川运动被大量的沙子和终碛石的漂流沉积物（形成了长岛和科德角）所记录下来。
3
Long-ago builders could have attached wooden poles to the stones and rolled then across the sand, the scientists say.