求解释

忍者22

Name : AC1PH - Steady-state (cosine) function. TYPE 14.
3 a: ]4 r3 ?! |6 Q; A0 v0 J8 cCard : SOURCE
, ]3 Y# B. }" w; YData :    U/I= 0: Voltage source. A radio button is used in newer ATPDraw versions.
; n9 q9 `! {# i) D7 W" N' q* }; T/ @              -1: Current source.
, b' p) f% m) Z1 J! X( d          Amp= The peak value in [A] or [V] of the function.
) S' d) w& _3 Y  ^            f= Frequence in [Hz].
          pha= Phase shift in degrees or seconds depending on A1.
           A1= 0: pha in degrees.
% H5 o% ?3 O0 V1 [6 n! ^( z7 J              >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.
; L# S3 A4 J6 N               Negative node is grounded.
For trapped charge functions: Specify a current source, a very low frequency, Tsta=5432. and Tsto=0.
1 y" T/ ~' f! I" L6 S1 DRuleBook: VII.C.4
请问红色字体是啥意思？