Altocumulus lacunosus. “An elusive prize for any cloud collector,” lacunosus clouds form when sinking pockets of air create holes in a cloud layer.

高积网状云。 “对于所有的观云爱好者来说，能欣赏到这种难以捉摸的云彩无异于恩赐，”当下沉的气团在云层中形成空洞时，网状云便出现了。

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Altocumulus clouds are small cumulus clouds that are knitted tightly together. These storm clouds often darken the land.

高积云是紧紧地交织在一起的小积云。这些雷雨云常常使大地一片昏暗。

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Altocumulus clouds are small cumulus clouds that are knitted tightly together. These storm clouds often darken the land.

高积云是紧紧地交织在一起的小积云。这些雷雨云常常使大地一片昏暗。

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