求解释

忍者22

Name : AC1PH - Steady-state (cosine) function. TYPE 14.
Card : SOURCE
( S. y) w: W3 I5 n9 qData :    U/I= 0: Voltage source. A radio button is used in newer ATPDraw versions.
+ }; e3 E  |; C8 k4 `) J$ F              -1: Current source.
* j4 @( [$ U! Y5 E! g, A          Amp= The peak value in [A] or [V] of the function.
            f= Frequence in [Hz].
4 @& K; Q1 z! ]$ q: Q$ w5 `          pha= Phase shift in degrees or seconds depending on A1.
# f0 P( |& w3 J! t, p3 ~2 a           A1= 0: pha in degrees.
              >0: pha in seconds.
         Tsta= Starting time in [sec.]. Source value zero for T<Tsta.
1 l4 u. Z7 u6 T# j$ _5 F/ K         Tsto= Ending time in [sec]. Source value zero for T>Tsto.
* H2 \+ N/ f6 ~2 }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.
RuleBook: VII.C.4
$ ]& C1 U, U5 W5 |1 P% c请问红色字体是啥意思？