I have seen one of the conventional steelworks: huge blast furnace, converter, steel ingot, miles of railway track.

我参观过传统的炼钢厂：巨大的高炉、转炉、钢锭，长达几英里的铁轨。

youdao

I had saw one of the conventional steelworks: huge blast furnace, converter, steel ingot, mile of railway track.

我参观过传统的炼钢厂：巨大的高炉、转炉、钢锭，长达几英里的铁轨。

youdao

I had saw one of the conventional steelworks: huge blast furnace, converter, steel ingot, mile of railway track.

我参观过传统的炼钢厂：巨大的高炉、转炉、钢锭，长达几英里的铁轨。

youdao