En-jín, iā ū kì ian-jín, siat-kè beh kā bó͘ chi̍t khoán la̍t-thâu choán chò kî-hâi tōng-le̍k ê ki-koan. Siōng kài phó͘-thong ê chi̍t chióng sī lāi-jiân en-jín (internal combustion engine), lī-ēng jiân-liāu to̍h-hóe ê jia̍t chhut la̍t sak kiâⁿ ki-hâi.