Yet, there are only 20 supervolcanoes on Earth.

然而地球上仅有 20 座超级火山。

Yet, there are a number of supervolcanoes on Earth building pressure.

然而地球上有很多超级火山正在积蓄压力。

Number 10 are supervolcanoes are becoming active.

第 10 个是超级火山正在变得活跃。

There are volcanoes known as supervolcanoes which, if they erupted, could end the world as we know it.

有些火山被称为超级火山，如果它们爆发， 可能会终结我们所知的世界。

So far, our species has survived 2,000 centuries, each with some extinction risk from natural causes— asteroid impacts, supervolcanoes, and the like.

到目前为止， 我们的物种已经生存了 2, 000 个世纪，每个世纪都面临着自然原因（小行星撞击、超级火山等）造成的灭绝风险。