These Ethiopian students marked their graduation with a high altitude balloon launch from Ysala, Ethiopia on July 10.

7月10日，这些埃塞俄比亚学生从埃塞俄比亚伊萨拉发射高空气球，庆祝他们的毕业。

The Tanzanian and Nigerian graduation ceremonies are scheduled to be held on July 27th, also with high altitude balloon launches.

坦桑尼亚和尼日利亚的毕业典礼定于7月27日举行，同时还将进行高空气球发射。

Before the age of rockets and the great space race, we were using high altitude balloons to take people to the edge of space.

在火箭时代和激烈的太空竞赛之前，我们使用高空热空气球把人们带到太空边缘。