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如果问起对世纪的上班族最流行的交通工具是什么，许多人也许想不到，答案竟是自行车。不过，与现在完全不同的是，那时的自行车是在全封闭的高速公路上以每小时46公里的速度行进。目前，欧美许多科学家正在考虑在一些大城市的主要公路上修建这种全封闭的自行车高速公路，其中?
If you ask what is the most popular means of transport for centuries-old workers, many may not have imagined that the answer is actually a bicycle. However, what is quite different now is that at that time the bicycle was traveling at a speed of 46 kilometers per hour on the totally enclosed freeway. At present, many scientists in Europe and the United States are considering the construction of this fully enclosed bicycle expressway on major highways in some big cities. Among them,