名词
中文翻译：心脏囊
同义词：
['cardiac sac', 'cardiac cavity', 'heart chamber']
例句：
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1. The surgeon removed the heart sac during the surgery.
外科医生在手术中取出了心脏囊。
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2. The patient's heart sac had to be opened to relieve pressure.
患者需要打开心脏囊以缓解压力。
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3. The heart sac is a vital organ that helps to pump blood throughout the body.
心脏囊是一个至关重要的器官，它帮助将血液泵送到身体各处。