隨著愈來愈多需要直接"緊貼耳朵"的商品出現，如ipod和手機，還有可維持長時間的可充電電池，我們的耳朵在過度"使用"之下，聽力也因此受到了損害。More headphone use leading to hearing loss
Young people, in particular, face increased risk of damage to ears
讀書運動都要聽iPod
Everywhere she turns, Angella Day sees people carrying portable music players, often with the ear buds stuffed firmly in place. "They're very widespread," says Day, a senior at Chicago's DePaul University who regularly listens to music on her own iPod while studying or working out. "So addicting."
What she and others may not realize is that many people their age have already damaged their hearing. And researchers fear that the growing popularity of portable music players and other items that attach directly to the ears — including cell phones — is only making it worse.
"It's a different level of use than we've seen in the past," says Robert Novak, director of clinical education in audiology at Purdue University in Indiana. "It's becoming more of a full-day listening experience, as opposed to just when you're jogging."
持久性可充電池讓我們聽的時間更久
With long-lasting rechargeable batteries, people who use portable music players also are listening longer — and not giving their ears a rest, says Deanna Meinke, an audiologist at the University of Northern Colorado who heads the National Hearing Conservation Association's task force on children and hearing.
到底聽多久才是安全的呢？
Meinke says a good rule of thumb comes from a study published in December: Researchers at Boston Children's Hospital determined that listening to a portable music player with headphones at 60 percent of its potential volume for one hour a day is relatively safe.
a rule of thumb:大致上
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