Today, their population is 12,000 strong... 如今 它们的种群数量已达12000多
The world's entire population of pygmy sloths is isolated 地球上所有的侏三指树懒都生活在
The entire population of these cave angel fish 世界上所有的洞穴天使鱼
the world's entire population in a single flock. 仅这一群便集中了世界上所有的花脸鸭