marginal magnetic track

例句：

1. 1. The research team used amarginal magnetic track to map the underground cavern.
   研究小组使用一个边际磁性轨迹来绘制地下洞穴。
2. 2. The scientistdiscovered a marginal magnetic trackthat could be used for navigation.
   科学家发现了一条可用于导航的边际磁性轨迹。
3. 3. The marginal magnetic track was crucial indetermining the location of the lost treasure.
   边际磁性轨迹在确定失落宝藏的位置中至关重要。