很多年过去，我们惊讶的发现，某天当某间房屋消失的时候，我们已经记不起它一开始的样子。

And surprisingly, considering the many years we've been doing this, once a house disappears, we can't remember what the original looked like.

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那些进行上百次的实践建立了测试学习的效果，让我们惊讶的发现，我们其实对于为什么测试能够提高记忆而一无所知。

Given that hundreds of experiments have been conducted to establish the effects of testing on learning, it's surprising that we know very little about why testing improves memory.

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但是，我们惊讶的发现这种阻滞药物在提高大龄小鼠的记忆上几天里就能发挥很大作用。这就说明了它可以对于年长人来说是个好的治疗方法。

But we were very surprised to find that the blocking compound works quickly over a few days to improve memory in old mice suggesting it might be a good treatment for the already elderly.

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