"原因"是一个汉语词，它的英文翻译是"reason"。"原因"是指导致某事情发生的根本原因。"Reason"来源于拉丁语"rationem"，意思是"思考，推理"。

一些例句：

The reason for her absence was a family emergency. 她缺席的原因是家庭突发事件。

Can you give me a good reason for why I should trust you? 你能给我一个让我相信你的充分理由吗？

After much consideration, I've decided to resign for personal reasons. 经过多方思考，我决定因个人原因辞职。