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来源 / unsplash

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Today, through its network of DSPs, Amazon delivers most of its own packages, and it surpassed FedEx in volume for the first time last year, according to the shipping company Pitney Bowes. Sebastian Festa, who owns a DSP in Florida, told CNN Business that most of his drivers prefer later dispatch times because they sleep in later and encounter less traffic while driving.

作者 | 首都医科大学附属北京同仁医院耳鼻咽喉头颈外科 孔颖

编辑 | 周亦川

今年3月3日是第二十五个全国“爱耳日”，也是全球的“世界听力日”。今年的主题是“科技助听，共享美好生活”。据世界卫生组织估算，目前全球约有15亿人患有不同程度的听力损失，到2050年，这个数字将增加到25亿人。听力障碍已经严重影响着人们的社会交往和生活质量，是全世界面临的重大公共健康问题。

对于不能通过药物治疗的轻度和中度感音神经性耳聋，可以通过助听器来改善听力。随着助听器技术的不断进步，助听器的外观设计越来越精美，体积也可以做到很小。助听器的芯片技术日臻完善，对声音信号的处理更加真实和细腻，在不同环境中的声音程序可以实现自动切换，同时在噪声环境中，对噪声的衰减，和言语声信号的提取都改善了听障朋友在各种环境下的听声情况。