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/ˈtʌnəl/
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n. 隧道，坑道，地道
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• The kids dug a tunnel in the sand. 小孩们在沙堆里挖了一个地道。
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【同】passage, passageway
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26
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den
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/den/
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n. 窝，兽穴
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• The lion lay asleep in its den. 狮子躺在洞里睡觉。
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extinct
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/iksˈtiŋkt/
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adj. 绝种的；熄灭了的
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• Dinosaurs have been extinct for millions of years. 恐龙已绝种几百万年了。
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【同】gone, dead
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existence
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/iɡˈzistəns/
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n. 存在，实在；生存
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• Pollution poses a threat to the continued existence of this species. 污染对这一物种的继续生存造成了威胁。
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creature
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n. 生物，动物，家畜
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• We should teach the children to have respect for all living creatures. 我们应当教导孩子们尊重所有生物。
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