3. 数学之美：参数化几何体与克莱因瓶
Audio company iFi just introduced a new DAC (digital-to-analogue converter) that's both smaller and lighter than its previous model, and only costs $59. The iFi GO Link 2 connects to a smartphone or other audio-playing device over USB-C and can instantly improve the listening experience on wired headphones.，详情可参考下载安装汽水音乐
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Фото: Антон Новодережкин / ТАСС