情况表明，如果用后来的数据，我们当时的估计在我们的成果发表后20年内都能很好地起作用；但从20世纪90年代中期开始，我们的理论开始失准。
It turns out that our estimates then, if applied to subsequent data, predicted long-term rates extremely well for the 20 years after we published; but then, in the mid-1990s, our theory started to overpredict.