指定初始化在C99：如何处理空未初始化结构体成员C11吗？
Designated Initializers in C99: How to handle empty uninitialized struct members in C11?
大经济体的G20成员国应当为具体的结构目标做出贡献，无论是提高退休年龄还是撤销类似物流等的管制。
The members of the G20 big economies could commit themselves to specific structural goals, from raising retirement ages to deregulating things like transport.
返回一个结构体，其中包含一个名为url的成员，该成员使用HTTP或ftp格式提供文件的url。
Returns a struct containing a member named url, which provides the url of the file using either HTTP or FTP.
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