subway system

Từ điển Oxford Learners Wordfinder Dictionary

noun

an electric railway operating below the surface of the ground (usually in a city)
- in Paris the subway system is called the 'metro' and in London it is called the 'tube' or the 'underground'
• Syn:
metro, tube, underground, subway
• Hypernyms:
railway, railroad, railroad line, railway line, railway system