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？
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？
问题解答：
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