官方在线文档里有http://manual.gromacs.org/curren ... le-formats.html#gro,三个方向的矢量box vectors (free format, space separated reals), values: v1(x) v2(y) v3(z) v1(y) v1(z) v2(x) v2(z) v3(x) v3(y), the last 6 values may be omitted (they will be set to zero). Gromacs only supports boxes with v1(y)=v1(z)=v2(z)=0.