Often, the fish escape and compete with native fish for food, leading to declines in native populations.

这类鱼经常在逃跑后和当地的鱼群争抢食物，因此导致当地鱼群的数量减少。

What you find is nine countries around the world that have significant native populations which speak both future less and futured languages.

你会发现全球范围内有九个国家其国民中有相当多的人使用没有区分将来时态和区分将来时态的语言。

A variant form of the EDAR gene is very common in East Asians and Native Americans, and is probably the reason that these populations have thicker hair than Europeans or Africans.

一个EDAR基因的变种形式在东亚人和美洲原住民中非常普遍，可能是这些人口拥有比欧洲人或非洲人更厚的头发的原因。