The earth is a miracle. 地球是个奇迹

167. How many species are we aware of?
     我们已知多少物种呢
168. A 10th of them? A hundredth perhaps?
     十分之一 百分之一
169. What do we know about the bonds that link them?
     他们之间的联♥系♥ 我们又知道多少呢
170. The earth is a miracle.
     地球是个奇迹
171. Life remains a mystery.
     生命依旧神秘
172. Families of animals form,
     动物形成的家庭
173. United by customs and rituals that survive today.
     依靠习性与惯例联合在一起 存活至今

来自《家园 第一部分 Home Part1》第 170 行