这种猫科动物的视频片段是在去年公布的。
Przewalski's horse, which once roamed the steppes of Mongolia, is thought to have become too dispersed in the wild to breed.普氏野马，这些曾经在蒙古草原上游荡的动物，被认为已经濒临灭绝。
Still, the fact remains that a simple change in oxygen levels produced naturally giant dragonflies--too bad we can't release them into the wild to take care of those deadly mosquitoes .不过，事实仍然是，仅仅改变氧气浓度一项指标，蜻蜓的体型就自然增大了。 遗憾的是，我们不能把这些巨型蜻蜓放到野外去对付那些致人死命的蚊子。
