key species

例句：

1. 1.The conservation of key species is crucial for the survival of our ecosystems.
   保护关键物种对于我们生态系统的生存至关重要。
2. 2. The research on key species has led to significant advancements in genetic engineering.
   对关键物种的研究已经导致了遗传工程的重大进步。
3. 3. The identification of key species is essential for understanding the biodiversity of a particular region.
   识别关键物种对于理解某个特定地区的生物多样性至关重要。