The researchers suspect that the shape of the human ear canal may be to blame for the pain.

研究者猜测，人们之所以觉得痛苦，是由于人类耳道的形状造成的。

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"What distinguishes one vowel from another is the shape of the waveform entering the ear," Dr. Shamma said.

“区分元音的根据是进入耳朵的波形形状，”夏玛博士说。

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Recently the imported porous polyethylene framework of high density has been used for external ear reconstruction by cutting and assembling in accordance with the shape of the normal ear.

或者采用进口的高密度多孔聚乙烯材料按健耳的大小和形状切削修整组装形成外耳支架。

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The distinctive rectangular shape of the in-ear, on-ear and over-ear headphones mirrors the back case of an iPhone, highlighting a design meant to pair with an iPhone, iPad or iPod.

ENGADGET: Harman Kardon trots out five iPhone-matching headsets, keeps you in high Apple fashion

With their pressure-relieving memory foam ear pads, the X Headphones conform to each listener's unique ear shape, providing a highly effective acoustic seal.

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