which is f , divided by the value of the x-axis here.

斜率，而f是p趋于0时pV的极限。

麻省理工公开课 - 热力学与动力学课程节选

These are insurance--or P&C--these are insurance companies that insure the value of a home or a business or an automobile.

简称P&C,这类保险公司,专门提供住宅,商业和汽车财产保险

耶鲁公开课 - 金融市场课程节选