De-Forest coil

例句：

1. 1. The De-Forest coils are a common sight in the forest.
   在森林里，森林缠绕的电线很常见。
2. 2. The power company had to replace the De-Forest coils due to the damage caused by the storm.
   由于暴风雨造成的损坏，电力公司不得不更换森林缠绕的电线。
3. 3. The De-Forest coils were used to protect the power lines from the elements.
   森林缠绕的电线被用来保护电力线免受恶劣天气的影响。