Confidence is the key to success.

信心是成功的关键。

《牛津词典》

The key to success is preparation.

成功的关键是准备。

《牛津词典》

Good communication is key to our success.

良好的沟通是我们成功的关键。

《牛津词典》

Harry Covert says the key to re-building the school, and all of Haiti,is to make sure the work is done right.

VOA: special.2010.02.05

This is a key to his character; these two episodes are the two that we're given of Moses' life.

这也是他性格的一大特点;,这是我们所看到描写摩西生平的两个片段。

耶鲁公开课 - 旧约导论课程节选

And I feel like the key to, you know, college is just to learn everything

而且，我认为，上大学的关键就是要广泛涉猎各门学问，

耶鲁对比哈佛 - SpeakingMax英语口语达人

But the key to this, it said, were two factors: remaining active and maintaining friendships.

BBC: Why old age need not be a burden

The key to cover-ups is to leave the evidence alone, make the story do the work.

NPR: Excerpt: 'Bangkok Tattoo'

Recognising when the time is right, and seizing the opportunity is absolutely key to success.

BBC: Women entrepreneurs: Starting out in your forties