A very large lowland plain on the surface of a Solar System body; pl. oceani. The only named example is Oceanus Procellarum on the Moon.
A very extensive, dark area on the surface of an extraterrestrial body.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。