求解释

忍者22

Name : AC1PH - Steady-state (cosine) function. TYPE 14.
$ L) Y  F: H% d( Z3 X+ KCard : SOURCE
' \1 C) Y3 E! f; F) s* rData :    U/I= 0: Voltage source. A radio button is used in newer ATPDraw versions.
, X6 e9 m' v8 Q$ a              -1: Current source.
4 p6 W/ q- Y) @9 z  }          Amp= The peak value in [A] or [V] of the function.
            f= Frequence in [Hz].
' }/ l+ C: _% @! L6 C5 y, C          pha= Phase shift in degrees or seconds depending on A1.
$ c6 N% ]3 e" X) N/ w% \0 D: S           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.
7 s. N' t. S+ j; m8 }8 [. g               Negative node is grounded.
For trapped charge functions: Specify a current source, a very low frequency, Tsta=5432. and Tsto=0.
  s( @2 k$ l0 ~3 h- `; |3 }RuleBook: VII.C.4
: G, ~# w9 m; p& r请问红色字体是啥意思？