origin
n. 起源,起因;出身,血统;(原)产地;肌肉起端;神经(或血管)起端;(数)原点
例句
The origin of the custom is obscure.
该习俗的起源鲜为人知。
《柯林斯英汉双解大词典》
The origin of the word remains obscure.
该词的来源尚不清楚。
《牛津词典》
They talked about the competing theories of the origin of life.
他们谈论那些相互矛盾的生命起源理论。