本源的

例句：

1. 1.The origin of the species is still a mystery to scientists.
   物种的起源对科学家来说仍然是个谜。
2. 2.The original manuscript was lost in the fire.
   原版手稿在火灾中丢失了。
3. 3.The origin of this phenomenon is still under investigation.
   这种现象的起源仍在调查中。