Who knows when you might want to clean your filter or front element that has become moist from going in and out of cold temperatures?

你不知道什么时候可能要清理滤镜或者镜头盖之类，因为在寒冷的环境中，镜头很容易变得潮湿。

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Now the city wants to become a “living laboratory” for smart urban technologies of all kinds—not just water and transport systems but green buildings, clean energy and city management too.

而今，这座城市希望成为各种智能城市技术的“生活实验室”，这些技术不仅包括供水与交通系统，还涉及绿色建筑、清洁能源及城市管理。

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For another, the XML: DB group is (in -) famous for developing specifications that hit a bit of a rut in mid-development, and yet are simple and clean enough to become widely implemented.

另外，XML： DB小组因为开发规范而出名(或者不那么出名)，这一点对中期开发有很大影响，而且该规范非常简单而清晰，容易得到广泛的实现。

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"I show Wales at its most industrial and now it's beginning to become clean and green again, " she said.

BBC: NEWS | UK | Wales | South West Wales | Artist draws on valley changes

If I were to place my bets, I would suspect that for a country to become a global leader in clean energy, they will have to be a leading innovator of the technology.

FORBES: Who Is Best Poised To Lead The Clean Energy Revolution?

In 2008, Ian Kiernan invited me to become Ambassador for the Clean Up the World campaign, which I have been for the past three years.

CNN: Opinion: We can help to save our seas but we must act now