Cheese is a good source of dairy. Most dairy products have calcium which you need for healthy teeth and strong bones
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the way you worded it is a little strange but the word I think you are looking for is holding.
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Why is it dangerous to listen to an MP3 player at excessively loud volumes for extensive periods? The mp3 player can be played above 85 decibels, which would cause damage to the hearing receptors, leading to (permanent)hearing loss.