He thought he had a key to the problem, but he found he did not get to the heart of it.

我们可以将这个比喻有错的句子直接翻译为：“他认为他掌握了解决这个问题的钥匙，但是，他发现他并没有接近问题的心脏。”

youdao

You have a problem of how to avoid initially sending the single secure key from the LDAP server to the LDAP client in plain text.

我们还有一个问题：如何防止出现以正文文本格式将密钥从 LDAP 服务器发送到 LDAP 客户机上的情况。

youdao

No matter how difficult the problem, synchronizing and managing the diverse data sources is a key requirement to keep your business competitive.

不管这个问题有多么困难，同步和管理不同数据源仍是使企业保持竞争力的关键需求。

youdao

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

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