0 a railway system in which electric trains travel through tunnels below ground -- 地铁；地铁交通
1 an underground passage that allows people on foot to cross a busy road -- 行人地下道，行人隧道
Many of the applications for this technology will be areas where airflow is constrained and deflected by obstacles such as inside buildings, mines and subway tunnels.
But the very success of the first subway contracts made expansion difficult.
These premises cannot be taken for granted, especially if you are not dealing with larger systems like street cars, subway trains, or trucks.
In contrast, in winter she prefers the subway.
These not-so-petty thieves wrap their lips around the coin slots on top of subway turnstiles.
They live in the underground sewage systems and subways in the winter and survive by begging.
For both, the subway afforded them a novel form of visuality.
This experiment is intended to simulate an indoor environment such as a mine, factory building or subway tunnel.
