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ÇൺϣÄá¶û·­Ò빫˾£¨www.joshualeeproperties.com£©2016Äê4ÔÂ25ÈÕÁ˽⵽£ºThe solar-powered aeroplane, Solar Impulse, has completed a three-day flight over the Pacific Ocean.

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It flew over San Francisco¡¯s Golden Gate Bridge on Saturday evening as it prepared to land in California.

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The plane took off from Hawaii on Thursday, where it underwent repairs for the past eight months after its batteries were damaged during the flight from Japan.

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This is the ninth leg of its attempt to fly round the world.

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"I crossed the bridge. I am officially in America," said pilot Bertrand Piccard as he flew above San Francisco Bay.

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Solar Impulse started the journey last March in Abu Dhabi. The trip has involved two different pilots flying separate legs.

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Piccard will land the plane later on Saturday evening at Moffett Airfield, located in Mountain View in Silicon Valley.

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The landing is being delayed until winds drop.

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Solar Impulse gets all its energy from the sun - through the 17,000 photovoltaic cells that cover the top surfaces of the craft.

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These power propellers during the day, but also charge batteries that the vehicle¡¯s motors can then call on during the night.

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The distance on this leg was 4,000km or 2,200 nautical miles.

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Starting in Abu Dhabi, UAE, in March, Solar Impulse crossed Oman, India, Myanmar, and China.

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It then flew to Japan, before undertaking a 8,924km passage to Hawaii.

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That five-day, five-night crossing set a record for the longest ever non-stop solo aeroplane journey.

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But the vehicle¡¯s batteries overheated during the trip, forcing the project to stop on the Pacific archipelago while repairs were conducted.

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A further 20m euros (16m pounds; 23m dollars) had to be raised from supporters during the winter to keep the project going for another year.

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Piccard shares flying duties with his business partner, Andre Borschberg.

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It was Borschberg who flew into Kalaeloa last July, and he will next take the controls on the next leg across the US mainland.

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The pair¡¯s intention is to reach New York by the start of June, to begin preparations for an Atlantic crossing.

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Assuming this is completed successfully, it should then be a relatively straightforward run back to the "finish line" in Abu Dhabi.

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They first trialled a smaller plane, taking it on a trans-America crossing in 2013.

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The version of the vehicle they currently fly is considerably bigger.

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Its wingspan is wider than a 747 jumbo jet, and, yet, it weighs only 2.3 tonnes.

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¡¯Living creation¡¯

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Because the prop-driven craft moves so slowly, mission legs can take several days and nights of continuous flight.

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This means Piccard and Borschberg - whoever is at the controls - have to stay alert for nearly all of the time they are airborne.

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They are permitted only catnaps of up to 20 minutes - in the same way a single-handed, round-the-world yachtsman would catch small periods of sleep.

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They also have to endure the physical discomfort of being confined in a cockpit that measures just 3.8 cubic metres in volume - not a lot bigger than a public telephone box.

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But Borschberg says the experience so far has been exhilarating.

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"An experimental plane is a living creation," he told BBC News.

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"Each flight you do brings new learning that you can use to improve the quality, reliability and performance of the aeroplane."

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