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　　Solar Impulse 2 is a single-seat airplane with awingspan of 72 meters, but it weighs only about thesame as a large car. The wings provide about 200square meters of space for solar cells that chargelithium-ion batteries, needed to keep it flying atnightIts four electric motors allow it to cruise at aspeed of up to 140 kilometers per hour, at anaverage altitude of 8,500 meters.

　　第二代的阳光动力号飞机是一架单座，翼展达72米, 而重量只相当于一辆大型汽车的飞机。它的机翼上集成了200平方米供锂离子电池蓄电的太阳能电池面板,其作用是夜间也能保障飞行。而四个电机使得这架飞机的巡航速度达每小时140公里,在平均海拔8500米的高度。

　　The longest flight of its predecessor, Solar Impulse 1, made in May 2013 from Phoenix,Arizona to Dallas, Texas, was just over 1,500 kilometers.

　　而初代阳光动力号飞机的最长飞行距离是2013年5月从亚利桑那州凤凰城飞往德克萨斯的达拉斯，距离只是刚刚超过1500公里。

　　But pilot Andre Borschberg, who once flew jets for the Swiss Air Force, says Solar Impulse 2with favorable weather will be able to fly much longer distances between stops.

　　但曾经效力于瑞士空军的飞行员安德烈·博斯伯格表示第二代凭借有利气候条件能够飞更长的距离。

　　“When we leave the coast of China, we don't know what the weather looks like on the otherside of the ocean. So these are big question marks.”

　　“当我们离开中国海岸,我们不知道大洋另一边是什么天气。所以这些在我们心头是个巨大的问号。”

　　It took 12 years of research and testing, including flights of the previous version, to finallybuild the aircraft they believe will be able to fly around the world in 20 flying days spread overthree months.

　　12年时间的研究和测试,包括参考先前版本的飞行数据,最终建造的这架飞机,他们相信可以在三个月20天内的飞行时间内开启全球之旅。

　　Chairman of the Solar Impulse project Bertrand Piccard says every detail on the airplane isdesigned for maximum efficiency.

　　阳光动力号飞机项目的主席博特兰德·皮卡德表示这架飞机上的每一个细节都是出于最大效能考虑而设计。

　　“This airplane is an example of energy efficiency, how we save the energy, and how the energyfrom the sun is enough to keep the airplane in the air day and night."

　　“这架飞机是节能的典范,我们如何节省能源,以及来自太阳的能量要保障飞机日夜在空中。”

　　While flying on auto-pilot, either pilot will be able to sleep for a while, use the toilet, evenexercise.

　　当飞机进入自动飞行模式,飞行员可以睡一会儿,去方便下,甚至锻炼。

　　Borschberg says the goal is not to promote building more solar-powered planes.

　　博斯伯格表示目标不是推动建造更多的太阳能飞机。

　　“It is to bring products to their clients which are more energy efficient: in home buildings, intransportation, in appliances, it can be lighting."

　　“这是要为他们的客户带来更节能的产品:房屋建筑、交通、电器,都可以如此。”

　　Solar Impulse 2 is scheduled to begin test flights in May, while the actual circumnavigation isplanned to start next March from an airport somewhere in the Persian Gulf.

　　第二代的阳光动力号飞机定于5月开始试飞,而实际的周游世界计划将于 明年3月在波斯湾的某个机场开始。