critical crack depth

例句：

1. 1.The engineer calculated the critical crack depth for the new material.
   工程师计算了新材料的临界裂纹深度。
2. 2. The research focused on understanding the critical crack depth in the material.
   研究专注于理解材料中的临界裂纹深度。
3. 3.The safety standards require that the critical crack depth be monitored regularly.
   安全标准要求定期监测临界裂纹深度。