chief species

例句：

1. 1. The study of the chief species in a particular ecosystem is crucial for understanding its biodiversity.
   研究特定生态系统中的主要物种对于理解其生物多样性至关重要。
2. 2.In conservation biology, the chief species are those that are most likely to be affected by human activities.
   在保护生物学中，主要物种是指最有可能受到人类活动影响的物种。
3. 3. The chief species of this region is a rare bird species known for its unique plumage.
   该地区的主要物种是一种罕见的鸟类，以其独特的羽毛而闻名。