重点词汇
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洞穴
cave; cavern; hole; earth; den; hollow; grotto; chamber; burrow; lair
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幽暗
dim; dark; gloomy; obscure; dusky; shadowy
be gloomy in the cave
洞穴
cave; cavern; hole; earth; den; hollow; grotto; chamber; burrow; lair
幽暗
dim; dark; gloomy; obscure; dusky; shadowy