有些方法已经存在，例如风力发电。

Some methods already exist, for example wind power.

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Stuggins说，现在已经有些可再生能源技术(如风力发电)具备了经济可行性。

Already some renewable technologies, such as wind power, are economically viable, he says.

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该安全和营救设备用于高大建筑物， 具体说例如风力发电机、钻井平台和天线塔。

The safety and rescue equipment is used in tall structures in particular, such as in windmills, on drilling platforms and in antenna masts.

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