求翻译：选题一：交通工具缩短距离节省时间。大自然给予的两地距离不能改变，但我们可以通过加快速度来节省时间。从步行----自行车---汽车---火车是什么意思？

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topic selection: transport shortened distance a saving of time. Given the nature of distance cannot be changed, but we can through accelerated to save time. Within walking distance from bicycle - - - - - - train cars

Selects a topic one: The transportation vehicle reduces the distance to save the time.The nature gives two places are away from cannot change, but we may through speed up the speed to save the time.From walk----Bicycle---Automobile---Train

Topic: transport to shorten the distance to save time. Nature given by the distance between the two places cannot be changed, but we can save time by speeding. Walking---cars-------bicycle train