谁能帮我分析一下这些命令流，求注解

命令流是这样的
/FILNAME，THE STATIC INFLATION OF AIRBAG
/TITLE，ANALYSIS OF AIRBAG INFLATION
/PREP7
ET,1,SHELL51
R,1,0.26,,,
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,163
MPDATA,PRXY,1,,0.25
N,1
N,20,25
FILL
E,1,2
EGEN,19,1,1
FINISH
/SOLU
AUTOTS,ON
NSUBST,100,300,50
NLGEOM,ON
SSTIF,ON
NROPT,FULL,,OFF
OUTRES,ALL,ALL
NEQIT,20
NSEL,S,LOC,X,0
DSYM,SYMM,X
NSEL,ALL
D,20,ALL
FLST,5,19,2,ORDE,2
FITEM,5,1
FITEM,5,-19
CM,_Y,ELEM
ESEL,,,,P51X
CM,_Y1,ELEM
CMSEL,S,_Y
CMDELE,_Y
SFE,_Y1,1,PRES,,0.25,,,（这句什么意思？）
ALLSEL
SOLVE
FINISH