real clouds / punch hole clouds may appear as a circular or oval
这种现象叫做雨幡洞云(fallstreak hole),属于气象变化的一种,也叫
every once in while, the cloud gives us sucker punch
cloud formations above kelowna a natural phenomenon
英国天空现巨大云洞奇观:或因飞机穿越云层飞机云层云洞
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