radius of meridional section

例句：

1. 1. The geologist measured the thickness of the rock layer using a meridional section.
   地质学家使用纬向剖面测量了岩石层的厚度。
2. 2.During construction, engineers often use meridional sections to ensure structural integrity.
   在施工过程中，工程师经常使用纬向剖面来确保结构完整性。
3. 3.The meridional section revealed that the fault zone is responsible for the earthquake activity in this region.
   纬向剖面显示，断层带是该地区地震活动的原因。