double goniometer

例句：

1. 1. The double goniometer was used to measure the angle of the roof.
   双测倾器被用来测量屋顶的角度。
2. 2. The engineer used the double goniometer to check the accuracy of the measurements.
   工程师使用双测倾器来检查测量的准确性。
3. 3. The construction crew used the double goniometer to ensure the stability of the building's foundation.
   建筑工人使用双测倾器来确保建筑物基础的稳定性。