wéi / xiū / rén / yuán / dǎ / kāi / chǐ / lún / xiāng / jiǎn / chá / lǐ / miàn / de / chǐ / lún / shì / fǒu / mó / sǔn

维修人员打开齿轮箱，检查里面的齿轮是否磨损。

The maintenance worker opened the gearbox to check whether the gears inside were worn.