there were one and a half billion people on Earth. 地球上生活着15亿人

1. A hundred years ago
   100年前
2. there were one and a half billion people on Earth.
   地球上生活着15亿人
3. Now, over six billion crowd our fragile planet.
   如今 已有超过60亿人拥挤在 我们这颗脆弱的星球上
4. But even so, there are still places barely touched by humanity.
   尽管如此 地球上仍有一些 人类极少涉足的地方
5. This series will take to the last wildernesses
   这部专题片将把你带到最后的蛮荒之地

来自《行星地球 第一季 第一集 Planet Earth S01E01 从北极到南极》第 2 行