中英释义：
重点词汇
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洞穴
cave; cavern; hole; earth; den; hollow; grotto; chamber; burrow; lair
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探察
explore; investigate; probe; survey; inspect; examine; scout; reconnoiter
洞穴
cave; cavern; hole; earth; den; hollow; grotto; chamber; burrow; lair
探察
explore; investigate; probe; survey; inspect; examine; scout; reconnoiter