planetary
词形变化：
词义辨析：
同义:
a.流浪的, 迁移不定的
wandering
moving
rambling
roving
unfixed
unsettled
restless
shifting
vagrant
gypsyish
nomadic
migratory
transient
vagabond
itinerant
peripatetic
a.地球(上)的, 现世的
terrestrial
earthly
terrene
subterrestrial
sublunary
global
worldwide
universal