哪位能帮我解读下这段命令流中每一句的意思！非常感谢！

*Step,name=Step-begin,NLGEOM=YES
*Soils,consolidation
3600,3600
*MODEL CHANGE,REMOVE
st-excavation-beigin,st-clayfortuguan-begin,st-clayforlining-begin
*MODEL CHANGE,ADD
TUGUANSUPPOT-BEGIN,LININGSUPPOT-BEGIN
*End step
***********************************
*Step,name=Step-tuguan,NLGEOM=YES
*Soils,consolidation
3600,3600
*MODEL CHANGE,REMOVE
st-excavation-01,st-clayfortuguan-01,st-clayforlining-01
st-excavation-02,st-clayfortuguan-02,st-clayforlining-02
st-excavation-03,st-clayfortuguan-03,st-clayforlining-03
*MODEL CHANGE,ADD
TUGUANSUPPOT-BEGIN,LININGSUPPOT-BEGIN
*End step