sphere gap

例句：

1. 1. The sphere gap between the two planets is about 250 million kilometers.
   两个行星之间的球体间隙大约是2.5亿公里。
2. 2.The sphere gap in this field of study is still not fully understood.
   这个研究领域的球体间隙仍然没有完全理解。
3. 3.The scientists are trying to fill in the sphere gap in their understanding of the universe.
   科学家们正在努力填补他们对宇宙理解中的球体间隙。