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duolingo 会员怎么买性价比最高
source link: https://www.v2ex.com/t/967257
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我之前是在安卓上刷 duolingo ，现在转到 ios 上发现必须要冲会员，否则会有红心限制，有点奇怪为什么安卓不需要 然后现在两周的免费使用就要结束了，怎么冲会员可以少花点，淘宝上的可以买吗。
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