单语范例（未经PONS编辑处理）
Robots have already been in use on space stations and planetary colonies, where the inhabitants are mostly highly trained scientists and engineers.
en.wikipedia.org It is also slightly metal-rich, a major factor in the formation of planetary systems.
en.wikipedia.org While it has no real world reference, see above for more information on the real world planetary system.
en.wikipedia.org The collection contains specimens from over 1,600 separate meteorite falls and finds, and is actively used internationally for planetary, geological and space science research.
en.wikipedia.org Irregular planetary migration would result in the depletion of the associated trojan reservoir.
en.wikipedia.org