如果该文件不存在或者有明确请求要求刷新文件，则代码获取存储在Amazon上的所有ami的详细列表。
If the file doesn't exist or there is an explicit request to refresh it, the code gets the list of details for all the AMIs at Amazon.
如果该文件不存在或者有明确请求要求刷新文件，则代码获取存储在Amazon上的所有ami的详细列表。
If the file doesn't exist or there is an explicit request to refresh it, the code gets the list of details for all the AMIs at Amazon.
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