问题描述：
请教此文中"union"的意思
原文:
No one can know what you will feel or fear in a time of need,but I learned that in this,the most difficult time of my life,the people our family depended upon most were people we had never met,people who we would likely never see again -- strangers.We depended upon strangers,strangers who knew their duty was to help others.We depended upon the nurses who cared so well for our son,who cooed to him and caressed him,who watched me hold him through the night and never seemed to notice how ugly a man is when he cries.We depended upon the hostel that gave us a place to stay near the hospital,upon the members of my ★union★ who believe caring for our child's health should not ruin us,upon the doctors and clerks and ambulance drivers.We depended upon a commitment made to helping others.This commitment is a web that holds us together in times of need.
原文:
No one can know what you will feel or fear in a time of need,but I learned that in this,the most difficult time of my life,the people our family depended upon most were people we had never met,people who we would likely never see again -- strangers.We depended upon strangers,strangers who knew their duty was to help others.We depended upon the nurses who cared so well for our son,who cooed to him and caressed him,who watched me hold him through the night and never seemed to notice how ugly a man is when he cries.We depended upon the hostel that gave us a place to stay near the hospital,upon the members of my ★union★ who believe caring for our child's health should not ruin us,upon the doctors and clerks and ambulance drivers.We depended upon a commitment made to helping others.This commitment is a web that holds us together in times of need.
问题解答：
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