Shelf clouds differ from roll clouds because shelf clouds are attached to a larger cloud system lurking above.
滩云与滚轴云不同,因为滩云上方紧接着的就是一片巨大的云系。
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This image, captured by NASA's MODIS satellite sensor on February 23, shows the shelf mid-disintegration, spewing a cloud of icebergs adrift in the Weddell Sea.