reason for

基本解释

What is the reason for it?
原因何在?
《新英汉大辞典》
The reason for all this?
所有这些的原因？
You have to have some reason for objecting which means you must be impacted by this.
你必须有些理由来反对,那意味着你必须被核电站所影响。

The report says one reason for the growing deadliness of cancer is more people smoking cigarettes in developing countries.
Now, there's an important reason for this genealogy, the idea that the muses are the daughter of Mnemosyne, the goddess of memory.
现在，对于这个宗谱有一个重要的解释，即缪斯女神们是记忆之神摩涅莫辛涅，的女儿。
耶鲁公开课 - 弥尔顿课程节选
What do you think is the reason for San Francisco being such a diverse place with people from all around the world?
为什么旧金山能聚集全世界各个地方的人呢？
移民者的都市 - SpeakingMax英语口语达人

And seven in 10 say Bush's overall job performance was the reason for the Democratic victory.
NPR: The Issue of Iraq Policy Change Takes Hold in Washington