茫茫

例句：

1. 1. The sea is vast and the sky is endless.
   海洋广阔无边，天空无限延伸。
2. 2.His mind was filled with a sense of confusion and helplessness.
   他的心中充满了困惑和无助感。
3. 3.The horizon seemed to stretch on forever, leaving me feeling utterly lost.
   地平线似乎无穷无尽，让我感到彻底迷失。