Language Point 15
... a surgical nurse's assistance during her first day on the medical team ... (Para. 4)
Meaning: ... a surgical nurse's help during her first day when she worked among other members of the medical team ...
assistance: n. help
With your assistance, I can finish the job in time.
有你的帮助,我能按时完成工作。
on: among (是)......的成员;供职于
on a team (是)一个队的成员
I am on the committee considering new members for our club.
我是俱乐部委员会的委员,负责审查俱乐部新成员的资格。