But that record is far too short to capture large-scale events like the drought that wiped out Roanoke -- events that we can confirm through other detailed climate records like tree rings or lake sediments.

• 但那些记录太短，无法捕捉到象毁灭罗安诺克的大旱这样的重大事件。这些事件我们可以从其它像树轮、湖泊沉淀物这些详细的气候记录中得到证实。