adaptive variable step-size

• 自适应变步长

adaptive variable step-size的用法和样例：

例句

1. Due to the use of discretion of variable substep,this software is more suitable to thin section,rotational castings.
   同时由于采用了变步长剖分，使本软件十分适合于处理薄壁回转类铸件的凝固模拟。