Then there was similar mortality in '97-'98. And what we found after drilling back in time two to 400 years was that these were unique events.
随后，97到98年（那次厄尔尼诺）的死亡率也跟这次很接近。 在“回溯”钻探了400年 后我们发现， 这些都是很独特的事件。