求解释

忍者22

Name : AC1PH - Steady-state (cosine) function. TYPE 14.
8 Q% k& Y; S$ c3 tCard : SOURCE
Data :    U/I= 0: Voltage source. A radio button is used in newer ATPDraw versions.
( E& r6 V" \- n: p# N/ F# B              -1: Current source.
          Amp= The peak value in [A] or [V] of the function.
            f= Frequence in [Hz].
0 j! l0 e9 z1 m  @5 G: `          pha= Phase shift in degrees or seconds depending on A1.
           A1= 0: pha in degrees.
              >0: pha in seconds.
6 `: j3 B. h/ R         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.
+ _# e9 e0 `- m1 G( E" K               Negative node is grounded.
& R* o- D" U* D- D  T8 nFor trapped charge functions: Specify a current source, a very low frequency, Tsta=5432. and Tsto=0.
$ w$ X( k4 C  ]7 B9 Q7 D- jRuleBook: VII.C.4
: t$ h4 a+ h7 a请问红色字体是啥意思？