我们如何学习 你如何学习
At Duolingo, our goal is to make language learning fun and effective. We think the best education should be full of play, so we're constantly developing new features that make learning new things — and practicing old things — feel like a game! At the same time, we're serious about taking a scientific, data-driven approach to all of our products, and about sharing what we learn with the world. In this post, we'll take a look at the science behind the Duolingo skill strength meter, which we published in an Association of Computational Linguistics article earlier this year....
在Duolingo，我们的目标是使语言学习变得有趣和有效。我们认为最好的教育应该是充满游戏的，所以我们不断开发新的功能，使学习新事物--以及练习旧事物--感觉像一场游戏同时，我们认真地对我们所有的产品采取科学的、数据驱动的方法，并与世界分享我们所学到的东西。在这篇文章中，我们将看看Duolingo技能强度表背后的科学，我们在今年早些时候在计算语言学协会的一篇文章中发表了这一观点：....
Strength meters
强度计
Any Duolingo user knows that we organize lessons into thematically or grammatically related skills. And any student of a second language knows that you gradually forget what you've learned over time. That's why Duolingo uses strength meters to help you keep tabs on how well you remember each skill, so you can go back and practice at just the right time.
任何Duolingo用户都知道，我们将课程组织成主题或语法上相关的技能。任何学习第二语言的学生都知道，随着时间的推移，你会逐渐忘记你所学的东西。这就是为什么Duolingo使用强度计来帮助你了解你对每个技能的记忆程度，这样你就可以在适当的时候回去练习。
**Figure 1.**Left: A Duolingo skill tree with strength meters. Right: A skill detail screen, showing words that most need to be practiced.
**图1.**左：带有强度表的Duolingo技能树。右图。一个技能细节屏幕，显示最需要练习的单词。
As soon as you finish a skill, its strength meter is usually at full bars (with a gold icon). Once the meter slips to half-full, though, you know it's time to practice. You can do this by choosing a skill to see your weakest words, and then strengthen them with a custom practice session made just for you.
当你完成一个技能时，它的强度表通常是满格的（有一个金色的图标）。不过，一旦能量表滑落到半满，你就知道是时候练习了。你可以通过选择一项技能来查看你最弱的单词，然后通过为你定制的练习课程来加强它们。
So how do these strength meters work? And how do we know which words you should practice at any given time?
那么，这些强度计是如何工作的？我们又如何知道你在任何时候应该练习哪些单词呢？