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探秘天坑7：我们新发现的西秦岭大天坑，背后的陡壁和疑似退化天坑
探秘天坑7，我们新发现的西秦岭大天坑， 背后的陡壁和疑似退化天坑。甘肃甘南藏族自治州迭部县！ 真实探索 实探地理奥妙，遍访大地神奇，我们爱科学，我们在探索！
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