coarse joining method

例句：

1. 1.The coarse joining method is used to join materials that have different densities.
   粗接合方法用于连接密度不同的材料。
2. 2.The coarse joining method has been shown to be effective in reducing stress concentrations.
   粗接合方法已被证明能有效减少应力集中。
3. 3.In this project, we will use the coarse joining method to ensure the structural integrity of the beams.
   在这个项目中，我们将使用粗接合方法来确保梁的结构完整性。