In-ear phones like Etymotic's ER6 go deep into the ear canal.

像音特美 ER6 这样的内置式耳机可以深入耳道。

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Previous studies have shown that the ear canal amplifies certain frequencies, including those in the range of 2000 to 4000 Hz.

先前的研究表明，耳道会使某些频率增强，包括在2000到4000赫兹之间的频率。

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The glands in the ear canal that produce the wax make too much in some people.

在有些人中，耳道中的腺体会产生过多的耳垢。

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The glands in the ear canal that produce the wax make too much in some people.

VOA: special.2010.03.31

The MDHearingAid also sits behind the ear with a plastic dome in the ear canal.

WSJ: Testing, Testing...Can You Hear Better Now?

It's not quite implantable, but Insound Medical's new Lyric hearing aid is about as close as you can get, with it designed to squeeze in deep in your ear canal and sit just a few millimeters from your ear drum.

ENGADGET: Insound's Lyric hearing aid cozies up right next to your ear drum

The company's own tests, sanctioned by a department of health in Russia showed that radiation around the ear canal was indeed dramatically lowered.

FORBES: Shield sham