real clouds / punch hole clouds may appear as a circular or oval
雨幡洞云层外文名:hole-punch cloud雨幡洞云又称穿洞云,通常会诚现
震撼十足细数空气中的十大奇异自然现象
a hole-punch cloud over mobile, alabama, in 2003.
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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