求解释

忍者22

Name : AC1PH - Steady-state (cosine) function. TYPE 14.
4 o- S2 ?3 Y, ?8 K/ V. ICard : SOURCE
0 f. n$ ^9 n3 U$ a& O) UData :    U/I= 0: Voltage source. A radio button is used in newer ATPDraw versions.
# E* i9 \+ j1 Z( D+ ~% o( X: O              -1: Current source.
          Amp= The peak value in [A] or [V] of the function.
( \6 }, I0 d  q; w) x            f= Frequence in [Hz].
          pha= Phase shift in degrees or seconds depending on A1.
           A1= 0: pha in degrees.
. j* O$ J3 ?- Z: n0 `) m              >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.
  y2 q2 }. z$ r: R: N* V9 a7 D               Negative node is grounded.
For trapped charge functions: Specify a current source, a very low frequency, Tsta=5432. and Tsto=0.
: u/ b( a& A( I" B$ xRuleBook: VII.C.4
9 V5 d( b5 B* k* l! f9 C! G6 M) e9 I0 S请问红色字体是啥意思？