162 篇文章
Today caves remain the least explored places on Earth.
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Today caves remain the least explored places on Earth. 今天 洞穴仍是地球上 人类最少涉足的地方

is today the longest continually erupting volcano on the planet,
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is today the longest continually erupting volcano on the planet, 是地球上现存持续喷发时间最长的火山