translation.en: So, ultimately what's going to determine the success or failure of SETI is the longevity of technologies, and the mean distance between technologies in the cosmos -- distance over space and distance over time.
translation.zh: 最终能决定SETI成功与否的 是科技的长存， 以及科技在宇宙中的平均距离 — 在时间与空间中的距离。