ear trumpet的解释
1. 助听筒：earth rod 接地棒 | ear trumpet 助听筒 | ear tympanic membrane magnifier 耳鼓膜放大镜
2. 号角状助听器：eanling 羊羔 | ear trumpet 号角状助听器 | ear 耳朵
noun
1. a conical acoustic device formerly used to direct sound to the ear of a hearing-impaired person
Synonym: hearing aid