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.
飞行家们一致认为这架飞行器是一架结构简单、容易操作又兼顾环保的交通工具。
Pilots have agreed that the Volantor is simple and easy to operate as well as being environmentally smart.
因为绿色环保是2012奥运的主题，伦敦想要让观众能通过步行，骑车或者交通工具到达会场。
With London aiming to make it possible for spectators to reach main venues by walking, biking or public transportation, green is clearly the color of the 2012 games.
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