spherical earth

例句：

1. 1. The planet Mercury is known for its spherical shape.
   水星以其球形而闻名。
2. 2. The sphere of influence of a government extends to its territory's borders.
   政府的势力范围延伸到其领土边界。
3. 3. The ball was spherical and perfectly round.
   这个球是球形的，完美地圆。