translation.en: I made a promise that the next time I would fly around the world, it would be with no fuel, independent from fossil energies, in order to be safe, not to be threatened by the fuel gauge.
translation.zh: 一个承诺，我将会进行下一个环球飞行 这将是无燃料， 完全不依靠陈旧的矿物能源， 为了安全起见， 不会受到燃料容量不够的威胁。