求解释

忍者22

Name : AC1PH - Steady-state (cosine) function. TYPE 14.
Card : SOURCE
' b: [9 O# n) r! hData :    U/I= 0: Voltage source. A radio button is used in newer ATPDraw versions.
- b- M) U& T( {7 q8 U              -1: Current source.
: F8 O  f) ^" w* N: m' w          Amp= The peak value in [A] or [V] of the function.
            f= Frequence in [Hz].
7 I7 ^- y5 G0 b% i          pha= Phase shift in degrees or seconds depending on A1.
           A1= 0: pha in degrees.
2 N1 Q% b' w: \& d- Y) W1 Y7 F5 c              >0: pha in seconds.
         Tsta= Starting time in [sec.]. Source value zero for T<Tsta.
6 h! Z( F; j' K7 ~3 U. @2 e1 M         Tsto= Ending time in [sec]. Source value zero for T>Tsto.
7 [+ M5 i' l8 b& W- F$ ^Node :     AC= Positive node of cosine function.
4 q# C/ A, a5 B               Negative node is grounded.
3 w" t( @; p0 K1 xFor trapped charge functions: Specify a current source, a very low frequency, Tsta=5432. and Tsto=0.
+ T3 B% q& m1 `- Q" b9 pRuleBook: VII.C.4
请问红色字体是啥意思？