Yangyang: How did people travel many, many years ago, Baobao?
阳阳:许多、许多年以前,人们怎样旅行,宝宝?
Baobao: They walked or rode horses because there were no bikes, cars, or buses.
宝宝:他们步行或者骑马,因为没有自行车、小汽车和公共汽车。
Yangyang: There were no ships, trains, or planes.
阳阳:没有轮船、火车和飞机。
Baobao: Travelling in the old days was very slow.
宝宝:在过去旅行非常慢。
Yangyang: Yes, it was difficult and dangerous, too.
阳阳:是的,它还很困难、很危险。
Baobao: Do you know who invented those vehicles?
宝宝:你知道谁发明了那些交通工具吗?
Yangyang: Some smart people did. Their inventions make our life easy and comfortable.
阳阳:一些聪明的人发明的。他们的发明使我们的生活变得既轻松又舒服。
Baobao: They also make travelling safe and fast.
宝宝:它们也使旅行变得既安全又快捷。