accidentaI species

• 次要种； (消落中)偶见的物种； 稀少的物种

accidentaI species的用法和样例：

例句

1. Species that were once sparse started to carpet the plots.
   曾经稀少的物种开始遍布草原。
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。