Gāngtiě gōngyè shì guómín jīngjì de zhīzhù chǎnyè.
The steel industry is a pillar of the national economy.
Tips
usage
Compound built from 钢铁 (gāngtiě, 'steel and iron') + 工业 (gōngyè, 'industry'). Same template gives 化学工业 chemical industry, 纺织工业 textile industry, 汽车工业 auto industry.