compound curve

例句：

1. 1.The compound curve of the earth's gravity field is a fascinating subject.
   地球重力场的复合曲线是一个引人入胜的主题。
2. 2.The compound curve of the earth's gravity field is used to predict earthquakes.
   地球重力场的复合曲线被用来预测地震。
3. 3.The compound curve of the earth's gravity field is a complex phenomenon that requires careful analysis.
   地球重力场的复合曲线是一种复杂的现象，需要仔细分析。