莽莽

例句：

1. 1. The grasslands are so vast that they seem to stretch on forever.
   草原如此辽阔，似乎一直延伸到地平线。
2. 2. The ocean is vast and mysterious, with countless unexplored corners waiting to be discovered.
   海洋广阔而神秘，无数未探索的角落等待着被发现。
3. 3.The sun's rays illuminated the vast expanse of the desert.
   太阳的光芒照亮了广袤无垠的沙漠。