As more and more people have private cars, the traffic congestion happens all the time, the popularity of bicycle will ease such situation, at the same time, it is good to people's health.

由于越来越多的人拥有私家车，交通堵塞经常发生，自行车的推广可以缓解下这样的情况，同时，也有益于人们的健康。

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However, the penny farthing's popularity lasted only about 20 years, until the advent of the safety bicycle.

不过，随着安全自行车的出现，这种车子只流行了大约20年。

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That was despite a big boost to bicycle sales in the summer, which rose on the back of the popularity of cycling during the London Olympics.

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