Ki-hâi sī óa-khò chi̍t kóa le̍k-liōng ūn-choán, thang thè-ōaⁿ jîn-le̍k kap tōng-bu̍t-le̍k ê khì-kū. Chiàu ha̍k-lí chi̍t kóa kán-tan ê ke-si tō ē-ēng-tit sǹg sī ki-hâi, pí-lūn chhu-phiâⁿ (inclined plane), lián-á, lô͘-si téng-téng; chóng-sī thong-sio̍k it-poaⁿ kóng ê ki-hâi sī khah hok-cha̍p ê hē-thóng chhin-chhiūⁿ o͘-tó͘-bái.