The North Atlantic right whale numbers less than 350 and it has been declining in population for several years.

北大西洋露脊鲸的数量不到350头，而且近年来数量一直在下降。

And another popular edible species across Japan, the Chinese puffer fish, has declined in population by 99.9% over the last 45 years.

在过去的 45 年里，日本另一种受欢迎的食用物种中国河豚的数量下降了 99.9%。

Just before 1431, significant battles occurred  between Angkor and neighboring kingdoms; the empire experienced a slow but constant  decline in population between 1350 and 1450 AD.

就在 1431 年之前， 吴哥与邻近王国之间发生了重大战争；公元 1350 年至 1450 年间， 帝国人口缓慢但持续下降。

So the rich countries of the world, the United States, Canada, Europe and so forth, Russia, Japan would actually be declining in population, Russia most certainly is, were it not for immigration.

因此，世界上的富裕国家， 美国、加拿大、欧洲等，俄罗斯、日本的人口实际上会下降， 如果没有移民， 俄罗斯肯定会下降。