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新专利暗示：未来苹果铅笔或可在任意平面甚至空中写字
source link: http://tech.ifeng.com/a/20180206/44871956_0.shtml?amp%3Butm_medium=referral
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新专利暗示：未来苹果铅笔或可在任意平面甚至空中写字
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