1. The threshold for pain,tissue damage,and potential hearing loss in humans is 120 decibels. 
   120分贝是人类感到痛苦、组织受损、造成潜在的听力丧失的下限。
2. He is on the threshold of adulthood. 
   他即将成为大人。
3. They are on the threshold of adulthood. 
   他们即将进入成年期。
4. He was at the threshold of his career. 
   他的事业才开始。
5. The threshold of a physiological or psychological response. 
   阈限生理或生理反映的下限

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