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一个down记住76个，大数据轻松学英语，高考、四六级、考研词汇
run down耗尽 let down失望，you will not let me down turn on/off/up/down win hands down轻松取胜，（注意体会：手都不用伸） go down in history名垂青史
一个单词记住xxx个，大数据背单词就这么简单，你学会了吗？14/53
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