French aeronaut Bertrand Piccard hopes to showcase the potential of green technology — the plane does not use a drop of oil.

法国热气球驾驶员Bertrand Pic card希望展现绿色科技的潜力，因为这架飞机并不耗一滴燃油。

Aeronaut John Steiner inflates his hot air balloon at Erie, Pennsylvania, as seen in the oldest known photograph of an aircraft, a quarter-plate ambrotype taken in June 1857.

气球驾驶员约翰·斯坦纳在宾夕法尼亚州伊利为自己的热气球充气。 图为最古老的飞行器照片，摄于1857年，采用的是四分之一感光底片旧式照相法。