That's because very large animals have a slow rate of reproduction, so all you have to do is remove a few young females from the herd, and you can, fairly quickly, significantly reduce the population.
那是因为大型生物的繁殖速度十分缓慢，所以只要除去象群中的几头年轻的母象，它们的数量就会大幅的下降。
2
That is some time after its neighbour, Macau, which has a higher reproduction rate, but a much smaller population.
（与生育率更高、人口要少很多的邻居澳门相比，这一时间要推后一些）。
3
The result revealed that there was obviously changed in age structure and reproduction structure of L. lagurus with the decline of the population quantity.