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。

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