policy：采用base 64编码并包含数据上传方式的一个JSON字符串。
Policy: a base 64-encoded JSON string constraining how data is uploaded.
由于FTP类上传软件的缺点，人们迫切需要一种界面友好、易于操作的文件上传方式。
A method of uploading files which has a good interface and facilitated cpntrol is urgently needed in stead of FTP software for its shortcoming.
罗伯逊对此解释说，那是因为我用的是有线宽带连接。这种网络连接方式以其上传速度之慢而闻名。
Robertson told me it was because I was using a cable broadband connection, which is notorious for slow upload speeds.
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