名词
中文翻译：内笼
同义词：
['inside cage', 'inner space']
例句：
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1.The bird was kept in an inner cage.
这只鸟被关在了一个笼子里。
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2. The scientist conducted experiments inside the inner cage.
科学家在内部笼子里进行实验。
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3. The animals were kept in inner cages for safety reasons.
出于安全原因，这些动物被关在了笼子里。