his last ocean journey was more than half a century earlier than Columbus' first journey to America这句话为什么要有“more than”“his last ocean journey was half a century earlier than Columbus' first journey to America”这样对吗？
问题描述：
his last ocean journey was more than half a century earlier than Columbus' first journey to America
这句话为什么要有“more than”
“his last ocean journey was half a century earlier than Columbus' first journey to America”这样对吗？
答