英文關鍵字
noise
ear
person
protection
safety
earplug
loud
equipment
quiet
sound
silence
male
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care
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hearing
prevention
people
hear
inserting
noisy
hand
plug
health
caucasian
adult
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soft
decibel
calm
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view
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eardrum
object
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audible
reusable
sleep
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comfortable
accessory
pollution
quietness
concept
industry
happy