听写填空,只写填空内容,不抄全文,5-10句,不用写标号,注意标点,口语中因结巴等问题造成的重复单词只写一遍~
Hints:
photosynthesis
Harry Gray: [---1---]
You're listening to Harry Gray, professor of chemistry at Caltech, he is using artificial photosynthesis to make solar fuel cells. [---2---]
Harry Gray: [---3---]
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Harry Gray: [---8-9---]
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Our thanks today to the Camille and Henry Dreyfus Foundation.
I’m Deborah Byrd, ES, a clear voice for science. We’re at ES. Org.
【视听版科学小组荣誉出品】
Natural photosynthesis uses natural materials, living materials. And artificial photosynthesis uses man-made materials. Just as plants use sunlight to make their own energy, Gray believes his solar fuel cells could one day create enough fuel from the sun to provide the energy humanity needs. So nature has already given us the example of what we must do. In place of a leaf, Gray’s team is building a tiny solar device to capture sunlight. The energy of the sun is used to split water into hydrogen and oxygen to create hydrogen fuel. He said these solar devices could carpet rooftops or operate in middle of the ocean, they'd be connected to fuel cells that will convert the solar fuel to energy. But first, Gray said, scientists need to find a way to make the technology less expensive. This is the challenge right now, to build a device as good as the ones we’ve already built that are extremely expensive. We need to build cheap devices, non-toxic devices, made out of earth abundant materials. He said he believes these solar fuel cells are still about 20 years away.