nèi / rán / jī / de / gōng / zuò / yuán / lǐ / shì / lì / yòng / rán / liào / zài / qì / gāng / nèi / rán / shāo / chǎn / shēng / dòng / lì内燃机的工作原理是利用燃料在气缸内燃烧产生动力The working principle of an internal combustion engine is to generate power by burning fuel inside the cylinder