请问下面的命令流怎么理解ini与 apply那?
new
gen zone b & size 6 6 6
model elas
ini sxx =-5e6 syy =-1e7 szz=-2e7
apply sxx = -5e6 range x -0.1 0.1
apply sxx =-5e6 range x 5.9 6.1
apply syy =-1e7 range y -0.1 0.1
apply syy = -1e7 range y 5.9 6.1
apply szz =-2e7 range z -0.1 0.1
apply szz =-2e7 range z 5.9 6.1