每个 API 请求要求事先取得 API 密钥。

Each API request requires an API key you need in advance.

珀迪已经两次向低等法院请求要求其命令刑事检控专员不要起诉其丈夫，均告失败。

Ms Purdy has already tried and failed in two lower courts to force the director of public prosecutions to spell out the circumstances in which he would prosecute her husband.

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.