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。