如果图片不存在缓存中，就根据给定url下载图片，否则返回缓存中的图片。
Downloads the image at the given URL if not present in cache or return the cached version otherwise.
在一个现场演示中，你可以再现你朝苹果专卖店走，会突然黑屏，显示“该图片不存在。”
In a live demo, you can reproduce how when you near towards the Apple store, the view goes black, noting “The image is no longer available.”
如果您想要看到的图片不存在，那么您可以从文件系统中将文件导入到Encyclopedia文件管理器，并使用该文件。
If the picture that you want to use does not exist there, you can import a file from the file system into the Encyclopedia file manager and use that file.
历史记录显示，阿赫那吞娶了著名的娜芙提蒂（上图）和另一位名为琪雅（下一幅图片）的女性为妻，但她们和阿赫那吞都不存在兄妹关系。
History records that Akhenaten married both the famous Nefertiti (above) and a woman named Kiya (next photo), but neither of these two women was ever said to be his sister.
本店所有照片均是实物拍摄或者官网图片，不存在任何PS痕迹。
All pictures are taken in kind or the official website picture, the absence of any traces of PS.
本店所有照片均是实物拍摄或者官网图片，不存在任何PS痕迹。
All pictures are taken in kind or the official website picture, the absence of any traces of PS.
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