名词
中文翻译：Unknown
同义词：
['inner cavity', 'inner space', 'inner chamber']
例句：
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1. The inner sac of the heart is filled with blood.
心脏的内腔充满了血液。
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2. The inner sac of the stomach is lined with mucous membrane.
胃的内腔被黏液膜覆盖。
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3. The inner sac of the brain is filled with fluids.
大脑的内腔充满了液体。