自行车是一种既便宜又环保的交通工具。
Bicycle is a cheap and environment-friendly means of transport.
从18世纪中期问世以来，自行车一直是一种广泛使用的交通工具。
Bicycles were first developed in the mid-18th century and have long since been used as a form of transport.
最重要的是，骑自行车对环境有益，因为自行车不需要耗油，它是一种零污染的交通工具。
Most important of all, it is beneficial to the environment to ride a bicycle because the bike doesn't consume petrol; it is a pollution-free transport.
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