Wéi / xiū / rén / yuán / fā / xiàn / jī / qì / de / zhǔ / zhóu / chéng / yǐ / jīng / yán / zhòng / mó / sǔn维修人员发现机器的主轴承已经严重磨损。The maintenance workers found that the machine's main bearing was badly worn.