linear elastoplastic fracture mechanics

例句：

1. 1.The road is linear and straight.
   这条路线是直线的。
2. 2.The data is linearly proportional to the input.
   数据与输入成正比例关系。
3. 3.The model assumes a linear relationship between variables.
   该模型假设变量之间存在线性关系。