暗线光谱

dark-line spectrum

variant of 暗[an4]

dark / gloomy / hidden / secret / muddled / obscure / in the dark

to close (a door) / to eclipse / muddled / stupid / ignorant / variant of 暗[an4]

variant of 線|线[xian4]

thread / string / wire / line / CL:條|条[tiao2],股[gu3],根[gen1] / (after a number) tier (unofficial ranking of a Chinese city)

light / ray / CL:道[dao4] / bright / only / merely / to use up

spectrum

chart / list / table / register / score (music) / spectrum (physics) / to set to music