你将不得不咬紧牙关。事实上，后来的SDK依赖于仅在10.6而不是10.5中可用的功能。

You're going to have to bite the bullet. The fact of the matter is that the later SDKs depend on features that are only available in 10.6 and not 10.5.

即使你在10.5上安装它也只有第一关。在那之后你可能甚至无法让它运行，或者它将无法正常工作或它将崩溃。等等。

Even if you get it to install on 10.5 that's only the first hurdle. After that you might not even be able to get it to run, or it won't work properly or it will crash,. etc. etc. etc.

苹果公司行动非常迅速，他们不会向后看，这是你必须习惯的东西。

Apple move very quickly, and they don't look backwards, it's something you'll have to get used to.