“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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爱普泰克 - 网易拍，哈哈哈哈～
for people can't read chinese you can ask people who speaks chinese "ai pu tai ke - wang yi pai", you will get the answer~