Guŏng-Sók
Guŏng-sók (光速) sê guŏng diŏh cĭng-kŭng dâi-dŏng giàng gì sók-dô.
Guŏng-sók kĕk „c“ lì biēu-sê. Guŏng diŏh 1 miēu dâi-dŏng chă-bók-dŏ̤ â̤ giàng 299,792,458 gŭng-chióh, sê ṳ̄-dêu diē-sié có̤i ká̤ gì sók-dô.
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