毛象的预览卡拉图有点奇怪，有些是400宽缩略图，有些就直接上1000px以上比如 https://t.co/DFhZvKNWZx
虽然我这个实例不知道为什么不显示这个地址的缩略另外有印象的大图预览好像都来自鸟站
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