軌道

Noun

 * 1) railroad track; railway; tram line
 * 2)  orbit
 * 3)  orbital
 * 4) trajectory

Verb

 * 1)  to abide by the laws and regulations; to follow the ways of propriety literally, "to ride on the [correct, proper] track"

Noun

 * 1)  orbit
 * 2)  orbital
 * 3) railroad track
 * 4) trajectory