principal species的用法和样例：
例句
- The regressive equations had remarkable precision available for using biomass to predict biomass of main tree species in this area.
回归方程精度较高，用于根据地区常绿阔叶林主要树种材积推算其生物量是可行的。 - A long-term phenological study on primary tree species of a natural broadleaf forest was conducted in the Fushan experimental forest of northeastern Taiwan.
摘要在福山试验林之天然阔叶林内对其主要树种进行长期物候调查。
