英语语法分析

The results show that main cause of conchoidal fracture forming is that composition segregation in solidification grain boundary of casting steel reduces the resistance of crack propagation.

结果表明，沿一次晶晶界的成分偏析对裂纹扩展阻力的降低作用是铸钢中贝壳状断口形成的主要原因。