struct node 1533 10.51,-9.36
struct node 1534 0.0,-4.0 slave x y 1529
struct node 1535 17.64,-12.99
struct cable begin node 1533 end node 1534 seg 1 tension 768000.0 prop 2001
struct cable begin node 1535 end node 1533 seg 6 prop 2002
struct prop 2001
struct prop 2002
struct prop 2001 spac 2.3 e 2.1E11 area 0.0015 yie 1e10 kb 0 sb 0
struct prop 2002 spac 2.3 e 2.1E11 area 0.0015 yie 1e10 kb 1.0E8 sb 1e8
請問這里面slave怎么設定,什么意思?