/-{-{guāngsù}-}-/, /kɔŋ³³ sɔk̚⁵/, /kɔŋ⁴⁴⁻²² sɔk̚³²/, /kɔŋ⁴⁴⁻³³ sɔk̚³²/, /kʷɔːŋ⁵⁵ t͡sʰʊk̚⁵/, /guangsuh/, /guangsù/, /guong1 cug1/, /gwong1 cuk1/, /gwong1 tsuk7/、/ㄍㄨㄤ ㄙㄨˋ/
光在真空中的速率