gōng rén / bǎ / kuài méi / sòng jìn / guō lú / què bǎo / shēng chǎn xiàn / huò dé / wěn dìng / de / rè liàng

工人把块煤送进锅炉，确保生产线获得稳定的热量。

The workers fed lump coal into the boiler to ensure a steady supply of heat for the production line.