有用
练习多了对数字的反应时间明显缩短。
Listen Number is not free (it costs 0.99), however it doesn't contain in-app purchases or subscriptions.
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The price of Listen Number is 0.99.
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练习多了对数字的反应时间明显缩短。
Chart
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Category
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Rank
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Top Paid
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45
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Top Paid
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464
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