origin of longitude

例句：

1. 1.The origin of the species is still a mystery.
   物种的起源仍然是个谜。
2. 2. The discovery of this new planet has sparked excitement among scientists.
   这一新行星的发现激发了科学家的热情。
3. 3.The origin of language is often debated in linguistics.
   语言的起源在语言学中常常被争论。