2 Give two advantages of air travel over rail travel for passengers.
2 Give two advantages of air travel over rail travel for passengers.
请举2例说明，对乘客来说，航空旅行相比铁路旅行的优势是什么？
2 Give two advantages of air travel over rail travel for passengers.
请举2例说明，对乘客来说，航空旅行相比铁路旅行的优势是什么？