Confidence is the key to success.

信心是成功的关键。

《牛津词典》

What is the key to healthy hair?

头发健康的关键是什么呢？

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Perhaps it is the key to the garden!

也许它就是花园的钥匙！

youdao

Coordinator Sally Stevenson says that public education is the key to stopping the spread of cholera.

VOA: standard.2009.09.14

You don't have to say that having the very same soul is the key to being the very same person.

你不必下结论说,只有拥有同样的灵魂,才能成为同一个人。

耶鲁公开课 - 死亡课程节选

And having the very same body is the key to to personal identity. It's not the same person.

而拥有同样肉体才是人格同一性的,关键，现在的并非原来那个人。

耶鲁公开课 - 死亡课程节选

Many retro-urban theorists maintain that high density is the key to urban prosperity.

FORBES: Megacities And The Density Delusion: Why More People Doesn't Equal More Wealth

Understanding yourself and your behavior is the key to creating an asset allocation that sticks.

FORBES: Is Cosmo Directing Your Portfolio?

But in specific, recurring situations, reversion to the mean is the key to identifying market behavior.

FORBES: Reverting To The Mean