491. It was a six-hour flight. 这是6小时的航程。
492. How many passengers were on the train? 火车上有多少乘客?
493. His friend was injured in an airplane crash.
他的朋友在飞机事故中受伤。
494. Would you like to go for a walk? 你喜欢去散散步吗?
495. Let"s go out to the airport. The plane landed ten minutes ago.
让我们去机场。飞机在十分钟前就已经着陆了。