To tell their story is a key reason for me to make the film.
拍这场电影的一个主要原因就是要讲述他们的故事。
For example, a key reason for Zheng's abnormal psyche is love failure.
比如，郑民生产生病态心理的一个重要因素是恋爱失败。
As I said before, the key to a positive life is to always, always, and always have a reason to get up in the morning.
就像我在前面说的，乐活的关键就是——早上永远有一个叫醒你的理由！
The reason is a mystery, but Mathews speculates that glucose may be key.
其中的原因是一个谜，不过马休斯推测：葡萄糖可能是个关键因素。
The reason is a mystery, but Mathews speculates that glucose may be key.
其中的原因是一个谜，不过马休斯推测：葡萄糖可能是个关键因素。
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