gōng chǎng lǐ de dà xíng jī qì zhèng zài zhá gāng, shēng chǎn jiàn zhù yòng de gāng bǎn

工厂里的大型机器正在轧钢，生产建筑用的钢板。

The large machines in the factory are rolling steel to produce steel plates for construction.