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24
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underground
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1705118175
/ˈʌndəɡraund/
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1705118177
adj. 地下的
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1705118179
• The cavers discovered a vast underground chamber. 探穴人发现了一个地下大洞穴。
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1705118181
【同】secret, undercover
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1705118183
25
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1705118185
tunnel
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/ˈtʌnəl/
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1705118189
n. 隧道，坑道，地道
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1705118191
• 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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1705118193
【同】passage, passageway
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26
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1705118197
den
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1705118199
/den/
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n. 窝，兽穴
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1705118203
• The lion lay asleep in its den. 狮子躺在洞里睡觉。
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27
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extinct
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/iksˈtiŋkt/
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1705118211
adj. 绝种的；熄灭了的
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1705118213
• Dinosaurs have been extinct for millions of years. 恐龙已绝种几百万年了。
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1705118215
【同】gone, dead
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1705118217
28
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1705118219
existence
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