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。”
It's a key problem for us to fully understand the Mass Culture.
这是我们理解有关大众文化一切问题的关键。
A problem occurred when the wizard attempted to rename a registry key.
向导试图重命名注册表项时发生错误。
It's a key problem to choose and fix the control valve well and make it run in high level condition.
选择和安装好调节阀，使调节阀在一个高水平状态下运行将是一个很关键的问题。
The control is a key problem to develop walking machine.
控制问题是步行机研制中的关键问题。
To apply a spacial remote sensor, the remote imaging analysis is the key problem.
空间遥感成像的分析对于遥感器的运用至关重要。
The key problem of this reaction is to select a suitable catalyst.
而选择合适的催化剂，是裂解反应的关键。
The key problem of this reaction is to select a suitable catalyst.
而选择合适的催化剂，是裂解反应的关键。
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