English translation of '原因'

名

1. reason
   ⇒ 这次没考好，主要原因是没重视。 (Zhè cì méi kǎohǎo, zhǔyào yuányīn shì méi zhòngshì.) The main reason I didn't do well in this exam is that I didn't take it very seriously.
   ⇒ 医生们尚未查出得这种病的原因。 (Yīshēngmen shàng wèi cháchū dé zhè zhǒng bìng de yuányīn.) The doctors have never established the causes of this illness.