thought to number only 3,000 in the wild. 据估在野外只有3000只
Today, in the forests of Southwest Australia, 如今在澳大利亚西南部的森林中
these small creatures were limited to a life in the margins. 这些小生物局限在边缘生活
...our own dynasty, the first true mammals, 我们自己的王朝 第一批真正的哺乳动物
were also making the most of the new abundance. 也在充分利用新的丰富资源
Across the world, dinosaurs now dominated 现在恐龙在全球各地