thin population

• 稀少的人口

thin population的用法和样例：

例句

1. This is a country of sparse population.
   这是个人口稀少的小国。
2. In theory, any species with a very small population could accumulate deleterious mutations faster than it can eliminate them.
   理论上，任何数量稀少的物种积累有害变异的速度都超过了它们消灭这些变异的速度。