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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Further, transplanted cells that migrated to the damaged area of the inner ear displayed shape similar to that of cochlear fibrocytes.

进一步，迁移至内耳受损区域的移植干细胞表现出与耳蜗纤维细胞相似的形状。

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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.

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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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