单词ear trumpet
na.: (从前半聋人用的号筒形)助听器
网络: 号角状助听器；助听筒
（旧时的）号角状助听器:
a device shaped like a trumpet , used in the past by people who could not hear well
(从前半聋人用的号筒形)助听器
He saw as with a microscope, heard as with ear-trumpet, and his memory was a photographic register of all he saw and heard.
他用放大镜来看，用听力器来听，而他的记忆又好像是他看到和听到一切的一张照相底板。
But Beethoven did not start using an ear trumpet until 1814.
但贝多芬直到1814年才开始带助听器。