You will never be ready for what you want to do.
你将永远不会为你还没做的事就准备好。
However, in an ideal world, your bank contact would already know what you came in for, and the necessary paperwork would be ready and waiting for your signature.
尽管如此，在一个理想世界里，你的银行联络人已经知道你此来的目的，并且必要的文档已经准备好，只等你签字了。
With a ready state of 4 and a status code of 200, you're ready to process the server's data and that data should be what you asked for (and not an error or other problematic piece of information).
如果就绪状态是 4 而且状态码是 200，就可以处理服务器的数据了，而且这些数据应该就是要求的数据（而不是错误或者其他有问题的信息）。
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