invisible range

例句：

1. 1. The invisible range of the forest is vast and mysterious.
   森林的隐形范围是广阔的，充满神秘。
2. 2. The scientist discovered an invisible range in the sky that could be used for communication.
   科学家发现了天空中一个隐形的范围，可以用来进行通信。
3. 3.The invisible range of the forest was so vast that it seemed to stretch on forever.
   森林的隐形范围是如此广阔，以至于看起来似乎永远也走不到尽头。