But remember, none of these recipes for success will work without the key ingredient: willpower.

但请记住，这些成功的秘方在没有关键成分时都不会有效：那就是意志力。

youdao

Don't leave home without the key.

千万别不带钥匙就离开家门。

youdao

Dont leave home without the key.

千万别不带钥匙就离开家门。

youdao

Professor Bacevich says the key U.S.goal could be achieved without the nation-building aspect of the plan.

VOA: standard.2009.03.27

Now, as obvious a statement as that is in this algorithm, it turns out that is the key to this whole problem being solved correctly without my algorithm looping infinitely.

这是此算法中很明显的一句话，也是正确解决,整个问题的关键,否则此算法就会陷入死循环。

哈佛公开课 - 计算机科学课程节选

It's deliberate that a lot of the examples in lecture are fairly short and bite-size so that you can actually focus on pulling out the key ideas without getting distracted by line and lines of code.

很多的演讲中的例子,是短小的,因此你们可以集中于提取其中的主要思想,而不是被一行行的代码给分心。

哈佛公开课 - 计算机科学课程节选

Both vehicles were manufactured with special keys that include a chip to prevent thieves from starting the vehicle without the key.

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Without the key -- well, the bike is just a bike.

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We have to learn how to compromise a lock that appears (and is supposed to be) impossible to open without the correct key or code.

FORBES: Japanese Secret Boxes: The Coolest Security Puzzles for Kids and Adults