spherical accretion

例句：

1. 1.The planet Mercury is known for its spherical shape and small size.
   水星以其球形和较小的尺寸而闻名。
2. 2.The sphere of influence of a planet extends from its orbit to the edge of the solar system.
   行星的引力范围从其轨道延伸到太阳系的边界。
3. 3. The sphere of influence of a planet is the area around it where it exerts an impact on the environment.
   行星的影响范围是围绕它对环境产生影响的区域。