An extremely dangerous place or situation; a perilous lair.
探险队决定深入那片原始森林，即便那里是虎穴龙潭，也阻挡不了他们探索的决心。
The exploration team decided to venture deep into that primeval forest; even if it was a tiger's den and a dragon's abyss, it couldn't stop their determination to explore.
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