美国有线新闻 CNN 可发电的太阳窗来了（在线收听）

What is the world's most widely used source of renewable energy? Solar power, wind energy, hydropower or bio-fuels.

世界上最广泛使用的可再生能源是什么？太阳能、风能、水力发电还是生物燃料？

Hydropower, hydroelectricity is used more than any other renewable.

水力发电是使用最多的可再生能源。

Hydropower is also one of the oldest forms of renewable energy. Wheels spun by the current of flowing water provided power for centuries before electricity caught on. Solar panels as we know them are a much more recent invention. Their development really started advancing in the 1950s. They come with some downsides. Though they're considered a form of clean energy, building the panels themselves and then disposing of old or damaged ones can cause significant harm to the environment.

水力发电也是最古老的可再生能源之一。在电力接通前，由水流转动轮子提供了数个世纪的电力。我们所知道的太阳能电池板是最近的发明。其发展真正开始于上世纪50年代。但它们也存在一些缺点。尽管太阳能板被认为是一种清洁能源，但自行建造面板再处理旧的或受损面板，可能会对环境造成严重危害。

And the solar windows you're about to see are relatively small. Manufacturers will have to find a way to build larger ones. Owners of skyscrapers will have to decide whether they want to install them. And there are questions about their cost versus modern windows that don't generate electricity. But the company that makes solar windows says the benefits are clear as glass.

大家即将看到的太阳窗相对较小。制造商需要找到方法来制造更大的窗户。摩天大楼的业主将不得不决定是否安装这些窗户。另外，与不发电的现代窗户相比，这些窗户的成本也存在疑问。但生产太阳窗的公司表示，其好处显而易见。