hearing aid
参考词典中hearing aid的常规释义：
基本释义
- n. 助听器
英英解释
2个名词解释
- an electronic device that amplifies sound and is worn to compensate for poor hearing
[同] deaf-aid, hearing aid - a conical acoustic device formerly used to direct sound to the ear of a hearing-impaired person
[同] ear trumpet, hearing aid
点击查看……- an electronic device that amplifies sound and is worn to compensate for poor hearing
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