据诺丁翰大学听力研究所的医学研究理事会主任马克·哈格德说，致使评估变得错综复杂的有两大问题。

There are two problems that complicate the assessment, according to Mark Haggard, director of the Medical Research Council Institute for Hearing Research at Nottingham University (MRCIHR).

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60岁以上的人超过一半因为年长失去听力，根据皇家国立聋人研究所(the Royal National Institute for the Deaf)介绍。

More than half of people over 60 lose hearing because of their age, according to the Royal National Institute for the Deaf.

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60岁以上的人超过一半因为年长失去听力，根据皇家国立聋人研究所(the Royal National Institute for the Deaf)介绍。

More than half of people over 60 lose hearing because of their age, according to the Royal National Institute for the Deaf.

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