Definition: If trains or buses are running, they are available to travel on. Level: B2
尽管天气恶劣，火车仍在运营。
Despite the bad weather, the trains are still ___running.
一辆班车每小时在酒店和机场之间往返一趟。
A shuttle bus ___runs between the hotel and the airport every hour.
在学期期间，有一趟特别的公交车每20分钟一班开往校园。
To get to the campus, a special bus ___runs every 20 minutes during term time.
