地球轨道

earth orbit

-ly / structural particle: used before a verb or adjective, linking it to preceding modifying adverbial adjunct

earth / ground / field / place / land / CL:片[pian4]

the earth / CL:個|个[ge4]

ball / sphere / globe / CL:個|个[ge4] / ball game / match / CL:場|场[chang3]

course / path / track / rail

track (for trains etc) / orbit (of a satellite) / (fig.) a person's established path in life / desired trajectory (of a business or other endeavor) / (audio engineering) track / (quantum mechanics) orbital

road / path / CL:條|条[tiao2],股[gu3] / principle / truth / morality / reason / skill / method / Dao (of Daoism) / to say / to speak / to talk / classifier for long thin things (rivers, cracks etc), barriers (walls, doors etc), questions (in an exam etc), commands, courses in a meal, steps in a process / (old) circuit (administrative division)