我们有意识要帮助建设更清洁的城市和更绿色环保的世界，以及有爱心，多为他人着想，而不只是想着自己且乐意去帮助别人时，就可以说我们长大了。
When we start to have a sense of offering a helping hand for a cleaner city and greener world, and when we have a loving heart to think more of others than of ourselves and are ready to help them, we can say that we have grown up.
如果把人类置于汽车之前，未来城市将变得更加绿色环保，干净整洁和充满活力。
The cities of the future might be greener, cleaner and more vibrant if people are put before automobiles. David Biello reports.
它既降低了汽车运营成本，又降低了城市空气污染，是目前全球极力推广的绿色环保产品之一。
It reduces both the automobile operation cost and air pollution in cities. Nowadays, it is one of green products which are strongly promoted all over the world.
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