求解释

忍者22

Name : AC1PH - Steady-state (cosine) function. TYPE 14.
* w/ F9 N$ j$ b8 M* M0 d1 lCard : SOURCE
6 a/ c8 K$ ~1 R* TData :    U/I= 0: Voltage source. A radio button is used in newer ATPDraw versions.
              -1: Current source.
% j3 A7 w0 F' k  o" _& D( s: I          Amp= The peak value in [A] or [V] of the function.
& s$ q0 |3 v( Q, J! A" A7 w. r            f= Frequence in [Hz].
          pha= Phase shift in degrees or seconds depending on A1.
           A1= 0: pha in degrees.
              >0: pha in seconds.
         Tsta= Starting time in [sec.]. Source value zero for T<Tsta.
         Tsto= Ending time in [sec]. Source value zero for T>Tsto.
Node :     AC= Positive node of cosine function.
               Negative node is grounded.
For trapped charge functions: Specify a current source, a very low frequency, Tsta=5432. and Tsto=0.
; h3 t" g% Y  ^RuleBook: VII.C.4
请问红色字体是啥意思？