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.

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负责城乡规划和城镇建设、交通、环保、土地管理等方面的工作。

Responsible for urban and rural planning and urban construction, transportation, environmental protection, land management work.

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这些逐渐变大的规模让全球交通规划者很头痛，他们无法做出决定：是鼓励这种绿色环保的交通方式还是出于安全考虑而禁止。

These larger models are causing headaches for global transportation planners. They cannot decide whether to embrace them as a green form of transportation, or ban them as a safety hazard.

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