guǐ dào
orbit
railway or tram line
fig. conventional way of thinking
guǐ dào jiāo tōng
metro
rapid transit
subway
shàng guǐ dào
to stay on track
to proceed smoothly
yuán guǐ dào
circular orbit (in astronomy and in astronautics)
guǐ dào cāng
orbital module
orbital cabin
zài rén guǐ dào kōng jiān zhàn
manned orbiting space station
dī dì guǐ dào
see 近地軌道|近地轨道[jin4 di4 gui3 dao4]
qīng xíng guǐ dào jiāo tōng
light rail
transit system (underground, at street level or elevated)
streetcar
metro
abbr. to 輕軌|轻轨[qing1 gui3]