radio (communication) ②wireless

line ②line (e.g. telephone line) ③ray (e.g. X-ray) ④line (e.g. of a railroad)

beam

one's line of sight

(weather) front ②front line

(war) front

circuit

horizon (related to land)

boundary line

main line

railway track

(one's) gaze ②point of view ③line covering someone's eyes (in an edited photograph)

Shinkansen

batting lineup (line-up)

route (bus, train, air, etc.) ②line (taken by a group, organization, etc.)

condescending attitude

frontline (military) base

front line

line

shamisen