This dissertation deals with the causes of hoarse voice from three as pects and how to protect vocal organs.
This dissertation deals with the causes of hoarse voice from three as pects and how to protect vocal organs.
从三方面阐述造成嗓音嘶哑的原因及其保护。
This dissertation deals with the causes of hoarse voice from three as pects and how to protect vocal organs.
从三方面阐述造成嗓音嘶哑的原因及其保护。