A dictionary in Objective-C is an object that holds two sets of information, a unique key and associated values, and enables you to use the key to retrieve items.

Objective - c中的字典是一个具有两组信息(惟一的密钥和相关的值)的对象，且使您能够使用该密钥来检索条目。

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This section contains several coding examples in c, illustrating a number of key principles and functions needed to build an effective custom performance monitoring application.

这一部分包含用C编码的几个示例，它们将说明构建有效的自定义性能监视应用程序所需的许多关键要素和函数。

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Normally, if you say -hashoption a=b=c to AppConfig, it will assign the key "a" the value "b=c" immediately.

通常，如果您在 AppConfig 中使用 -hashoption a=b=c，它将立即为关键字 "a" 赋值 "b=c"。

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We've got some chords set out and we're going to-- we've got some chords set out here and we're in the key of C at this point, and we're going to hear Beethoven go to a tonic chord, then a sub-dominant chord, then a tonic chord, then a dominant chord and so on.

我们看到有一些和弦-,而我们现在在C调的位置上，然后听贝多芬的主音和弦，然后是次属音和弦，然后是主音和弦，接着是属音和弦，如此往复。

耶鲁公开课 - 聆听音乐课程节选

But a C grade or above in GCSE English is also a key element on which national league tables are based, increasing pressure on teachers to ensure their students get the best results possible.

BBC: GCSE English: How is it marked?

C-MAX Energi operates just like a traditional hybrid with two key differences - owners must plug in the vehicle using its charge port and C-MAX Energi has a larger battery pack.

ENGADGET: Ford's 2013 C-Max Energi rolls out 95 MPGe, arrives later this fall

With a study released this morning, Vertex Pharmaceuticals cemented a key advantage in what is expected to be a booming new market for hepatitis C drugs this morning, increasing its edge over Merck, its main competitor.

FORBES: Vertex's Big Advantage