principal species的用法和樣例：
例句
- The regressive equations had remarkable precision available for using biomass to predict biomass of main tree species in this area.
回歸方程精度較高，用於根據地區常綠闊葉林主要樹種材積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.
摘要在福山試驗林之天然闊葉林內對其主要樹種進行長期物候調查。
