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People should listen to music for no more than one hour a day to protect their hearing, the World Health Organization suggests. 世界卫生组织（WHO）建议，为了保护听力，人们每天听音乐的时间最好不要超过1个小时。 It says 1.1 billion teenagers and young adults are at risk of permanently damaging their hearing by listening to "too much, too loudly". 据悉，全球有11亿的青少年由于听音乐的“时间过久、音量过大”而处于可能永久性听力损害的危险之中。 WHO figures show 43 million people aged 12-35 have hearing loss and the prevalence is increasing. WHO的数据显示，12-35岁年龄段的人群中有4300万人的听力已经在减退，而且这个人数还在进一步增加。 In that age group, the WHO said, half of people in rich and middle-income countries were exposed to unsafe sound levels from personal audio devices. 据WHO称，该年龄段内有一半人来自中高收入国家，经常暴露在高音量的个人音响设备之中。 Meanwhile 40% were exposed to damaging levels of sound from clubs and bars. 有40%的人暴露在具有损坏性音量的俱乐部和酒吧中。 The proportion of US teenagers with hearing loss went from 3.5% in 1994 to 5.3% in 2006. 在美国，青少年听力损害的比例已由1995年的3.5%上升到了2006年的5.3%。 | 
