1. John Westfall is the science editor for the Association of Lunar and Planetary Observers. 约翰?威斯特福尔是月球与行星观察者联盟的科学版编辑。
2. Add a global perspective and you up the scale to cover the entire planetary network of human activity. 增加一点全球观念你就能跃上一个台阶，用人类活动的网络去覆盖整个地球。
3. One of the four brightest satellites of Jupiter and the sixth in distance from the planet. Originally sighted by Galileo, it is the largest planetary satellite. 卡利斯托卫星：木星最亮的四颗卫星之一，是距木星第六远的卫星。最初为伽利略所发现，它是最大的行星卫星。
英英解释
adj.
1. of or relating to or resembling the physical or orbital characteristics of a planet or the planets
2. of or relating to or characteristic of the planet Earth or its inhabitants
3. having no fixed course
4. involving the entire earth; not limited or provincial in scope
