E̍k-keng (易えき經けい; ia̍h-keng)[1] ia̍h sī kiò choè Chiu-e̍k (周しゅう易えき), sī chi̍t ê Tiong-kok thoân-thóng bûn-hiàn, kap Si-keng, Siōng-su, Lé-kì kap Chhun-chhiu hō͘ Jû-ka tâng-chê kiò choè "Ngó͘-keng".