The National Mining Association refused to single out Massey during the hearing, saying only that the mining industry wants to improve its safety record across the board.

VOA: standard.2010.04.27

Cochlear implants, so that's the same kind of function as a hearing aid, to improve hearing, but using a different mechanism.

人工耳蜗移植术,人工耳蜗与助听器同作用相同,都可以改善听力,只是两者原理不同

耶鲁公开课 - 生物医学工程探索课程节选