正常听力 meaning in Chinese

normal good hearing

A person with normal hearing can usually locate the source of a sound even with his or her eyes closed
拥有正常听力的人即使闭上眼睛，通常仍然可以分辨出声音的来源。
What is more , people with normal hearing can pick up relatively quiet sounds ? say , an interesting conversation ? amid loud background noise
不仅如此，拥有正常听力的人，还能从吵杂的背景噪音之中，听出相当细微的声响（比如一段有趣的对话）。