自动保持远程图片到本地，并且自动生成缩略图。
Automatically keep the remote picture to the local, and automatically generate thumbnails.
从高分辨率图形自动生成缩略图的技术已经很成熟了，可以在其中选择比较合适的解决方案。
Technology for automatically creating thumbnails from higher resolution graphics is readily available — some solutions provide more elegant results than others.
详细说明： XUploadFiles 是一个用于辅助网站进行文件上传的客户端插件，同时能够自动生成图片的缩略图。
XUploadFiles is a client-side plug-in that can be used to assist in uploading files to a website, and automatically generates thumbnails of images.
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