pivot on (或upon)

• • 视…而定；依靠；随…转移；以…为中心：

    The play pivots on the relationship between the two sisters.

    这出戏以两姐妹之间的关系为中心。

  • 绕着…转动；以…为轴心转动：

    She pivoted on her heels and swept out.

    他一转身，匆匆走了出去。

  • 用脚转动：

    She pivoted on her toe and faced me.

    他踮起脚转向我。