pivot

/ˈpɪvət/

the person in a rank around whom the others wheel and maneuver

中文释义：核心人物；枢纽

She became the pivot of the team, coordinating all activities.

她成为团队的核心人物，协调所有活动。

The pivot in the negotiation was the CEO's final decision.

谈判中的关键人物是CEO的最终决定。