Some suggest that Columbus himself visited Canada or Greenland before 1492, because according to Bartolomé de las Casas he wrote he had sailed 100 leagues past an island he called Thule in 1477.
一些人暗示，哥伦布在1492年之前就亲自造访了加拿大或格陵兰，因为根据巴尔托洛梅·德·拉斯卡萨斯所说，哥伦布曾写道，他在1476年曾经航行了100里格，经过了一座他称之为图勒的岛屿。