1. You can answer based on your personal experience of seeing advertisements on trains or other forms of transportation. 2. You can also discuss the prevalence and impact of such advertising, such as its frequency, effectiveness, or how it affects your travel experience.

1. 你可以根据自己在火车或其他交通工具上看到广告的个人经验来回答。 2. 你也可以讨论这种广告的普遍性和影响，比如它的频率、有效性或它如何影响你的旅行体验。