spherical indicatrix of tangent to a curve

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 company extends beyond its borders.
   公司的势力范围超出了其边界。
3. 3.The sphere of influence of the law extends to all areas within its jurisdiction.
   法律的势力范围延伸到其管辖的所有领域。