macro cross-section

例句：

1. 1.The engineer used a macro cross-section to design the new bridge.
   工程师使用宏观截面设计了这座新桥。
2. 2. The scientist conducted experiments on the macro cross-section of the material.
   科学家对材料的宏观截面进行了实验。
3. 3.The doctor examined the patient's macro cross-section and found no signs of infection.
   医生检查了患者的宏观截面，没有发现感染的迹象。