spherical coupling

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 is usually spherical.
   影响范围通常是球形的。
3. 3. The earth's equator is a spherical circle.
   地球的赤道是一个球形的圆。