1. Discuss both the cheapest and most expensive means of transport based on your knowledge or experience. 2. You can provide reasons why certain modes are cheaper or more expensive, considering factors like fuel efficiency, maintenance costs, or infrastructure requirements.

1. 根據您的知識或經驗，討論最便宜和最昂貴的交通方式。 2. 您可以提供某些方式較便宜或較昂貴的原因，考慮燃油效率、維護成本或基礎設施要求等因素。