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关注：1
2013-05-23 12:21
求翻译：The invention is in particular suitable for hearing impaired persons, but may also be used in environments where protection to sounds is required, especially when only a certain frequency range needs to be attenuated and other frequencies may not 。 It is further mentioned here that the method in a preferred embodiment是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
The invention is in particular suitable for hearing impaired persons, but may also be used in environments where protection to sounds is required, especially when only a certain frequency range needs to be attenuated and other frequencies may not 。 It is further mentioned here that the method in a preferred embodiment
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