translation.en: It wasn't until we really left Earth, got above the atmosphere and had seen the horizon bend back on itself, that we could understand our planet as a limited condition.
translation.zh: 直到我们真的 离开了地球， 来到大气层之上 看到地平线 向后弯曲， 我们才明白我们的地球 处于一种极限状态。