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.
虽然可使用GD软件包生成缩略图(请参阅参考资料)，但本文假设已经准备好了缩略图。
Though you could use the GD package to generate the thumbnails (see Resources), for this article, you are expected to have the thumbnails already prepared.
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.
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