jī / qì / yùn / xíng / shí / chǐ / lún / tū / rán / kǎ / zhù / yuán / lái / niè / hé / bù / fen / chū / le / wèn / tí

机器运行时齿轮突然卡住，原来是啮合部分出了问题。

When the machine was running, the gears suddenly jammed—it turned out there was a problem with the meshing part.