Can I write an iPhone application in any language other than Objective-C?

Is it possible to write an iPhone 开发者_如何学运维application in any language other than Objective-C?

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Basically, there's 3 major options for iPhone/iOS programming:

1. Objective-C
2. MonoTouch (C# for iOS)
3. Adobe AIR

There are probably some other possibilities (such as Unity, but that's for 3d game development and costs $99), but those are the major ones.