contravarlant base vectors

例句：

1. 1. The researchers used the contravariant base vectors to calculate the displacement of the object.
   研究人员使用反斜率基向量来计算物体的位移。
2. 2. The experiment involved measuring the contravariant base vectors in different directions.
   实验涉及在不同方向测量反斜率基向量。
3. 3. The study focused on the application of contravariant base vectors in engineering design.
   该研究关注反斜率基向量在工程设计中的应用。