最令人担忧的是存放在3号和4号反应堆的用过的核燃料棒。
Of greatest concern are the spent fuel rods stored at reactor Nos. 3 and 4.
但是，搞清楚如何处理用过的核燃料是一个大问题，也是一个几十年来没有得到很好解决的问题。
But figuring out what to do with the nuclear fuel they generate is a big issue - and one that hasn't been resolved for decades.
按现在情况看，干桶存储方法可以让我们安全度过下个世纪，但在以后的九千九百年里那些用过的核燃料仍然是个问题。
In the meantime, dry-cask storage can get us through the coming century, but those used fuel rods will remain a problem for at least another 9,900 years after that.
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