At present, most of the motorcycle engines use the traditional natural air cooling systems which have simple structures but unideal cooling effect.

目前，大多数摩托车发动机均采用传统的自然风冷却系统。

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These homes were all built to take advantage of simple, natural cooling methods–no air conditioner required.

这些住宅都利用简单、自然的冷却方法而建——无需空调。

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But natural cooling techniques have been used for as long as humans have been building homes; after all, the modern air conditioner is a relatively recent invention.

但是，尽管现代空调器是一种相对新兴的发明，自然冷却技术的使用却和人类建造房屋的历史一样久远。

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Designers claim that plants not only provide a beautiful alternative to other materials used in construction, they also offer additional benefits, including noise reduction, natural cooling, air conditioning and a psychological boost to those who use the buildings.

CNN: Green walls: the growing success of 'vegitecture'