求解释

忍者22

Name : AC1PH - Steady-state (cosine) function. TYPE 14.
Card : SOURCE
Data :    U/I= 0: Voltage source. A radio button is used in newer ATPDraw versions.
* m5 ?; c: x3 b+ C% J5 @: B9 G' p              -1: Current source.
          Amp= The peak value in [A] or [V] of the function.
% D1 B. b6 u- p% B# }% Z            f= Frequence in [Hz].
% B1 n3 I  o, t9 X# D1 |          pha= Phase shift in degrees or seconds depending on A1.
! B) \+ d  ]0 T7 C3 i           A1= 0: pha in degrees.
              >0: pha in seconds.
  r' v& V3 z" A         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.
* f  G3 {. r1 {' M# x               Negative node is grounded.
# ?3 z8 z  L- GFor trapped charge functions: Specify a current source, a very low frequency, Tsta=5432. and Tsto=0.
RuleBook: VII.C.4
请问红色字体是啥意思？