polar pantograph

例句：

1. 1. Thepolar pantograph was used to sendmessages across the Arctic Ocean.
   极地测距仪被用来在北极海域发送信息。
2. 2. The polar pantograph was arevolutionary tool for communication in remote areas.
   极地测距仪是远程地区通信的一场革命。
3. 3. The polar pantographwas essential for mapping the polar regions.
   极地测距仪对于绘制极地区域至关重要。