1. Discuss common issues faced by people when using various transportation methods such as buses, trains, cars, or bicycles. 2. You can mention problems like delays, overcrowding, cost, safety concerns, and environmental impact.

1. 讨论人们在使用公交车、火车、汽车或自行车等各种交通方式时面临的常见问题。 2. 您可以提到延误、拥挤、费用、安全问题和环境影响等问题。